{"Entry":{"collection":"sqlstate","key":"08001","name":"08001","aliases":[],"metadata":{"aliases":[],"case_count":1,"class_code":"08","condition_name":"sqlclient_unable_to_establish_sqlconnection","condition_names":["sqlclient_unable_to_establish_sqlconnection"],"content_hash":"65581dcdda492e27fdf157e7cc9b347893b1f50f28aa01ad1c72fa92f8a12ee9","depth":"full","editorial_review":"reviewed","evidence_tier":"observed_runtime","imported_at":"2026-09-30T17:45:26.683178+08:00","introduced":null,"known_present_by":"7.4","macros":["ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION"],"name_zh":"无法建立 SQL 连接","present_in":["9.0","9.1","9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19"],"preview_in":["19"],"primary_macro":"ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION","removed":null,"runtime_verification":"passed","severity_classes":["E"],"snippet_count":1,"source_rev":"english-manuals:a5abb353e53fa2f90c0570507acb7ee80d6953345afe1e7a1da450ed89d6105a","sqlstate":"08001","status":"active","summary_zh":"无法建立到目标服务器的新连接。"}},"Definition":{"Collection":"sqlstate","Key":"08001","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"08001","SourceRevision":"english-manuals:a5abb353e53fa2f90c0570507acb7ee80d6953345afe1e7a1da450ed89d6105a","Facts":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"08001"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"08001","SourceDatabase":"center","Version":"","Locale":"en","Title":"08001 — sqlclient_unable_to_establish_sqlconnection","Summary":"SQLSTATE 08001 is sqlclient_unable_to_establish_sqlconnection in Class 08. 08001 is the server-side SQLSTATE for a client connection that could not be established. In the selected dblink_connect path the ERROR primary is could not establish connection and the refused-port reason is dynamic DETAIL; this differs from 08003 (an absent dblink handle) and startup failures such as 28000, 28P01, and 3D000.","BodyHTML":"\u003ch1\u003e08001\u003c/h1\u003e\n\u003ch2\u003eAt a glance {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003eSQLSTATE \u003ccode\u003e08001\u003c/code\u003e is \u003cstrong\u003esqlclient_unable_to_establish_sqlconnection\u003c/strong\u003e in Class \u003ccode\u003e08\u003c/code\u003e. \u003ccode\u003e08001\u003c/code\u003e is the server-side SQLSTATE for a client connection that could not be established. In the selected \u003ccode\u003edblink_connect\u003c/code\u003e path the ERROR primary is \u003ccode\u003ecould not establish connection\u003c/code\u003e and the refused-port reason is dynamic DETAIL; this differs from 08003 (an absent dblink handle) and startup failures such as 28000, 28P01, and 3D000.\u003c/p\u003e\n\u003ch2\u003eMeaning {#meaning}\u003c/h2\u003e\n\u003cp\u003eThe server-side \u003ccode\u003edblink_connect\u003c/code\u003e branch emits this code after libpq cannot open the requested remote endpoint. Its fixed diagnostic is an ERROR with primary \u003ccode\u003ecould not establish connection\u003c/code\u003e; the endpoint and operating-system reason are dynamic DETAIL text. The condition concerns establishing a named remote handle, so it is different from an absent handle (08003) and from startup rejection before a session exists (28000 or 3D000).\u003c/p\u003e\n\u003cp\u003eThe source does not format the DETAIL itself: \u003ccode\u003edblink.c\u003c/code\u003e passes the libpq error string through \u003ccode\u003eerrdetail_internal(\u0026#34;%s\u0026#34;, msg)\u003c/code\u003e. That distinction matters when comparing versions or clients. The 18.6 refusal observed below includes the host, port, and \u003ccode\u003eConnection refused\u003c/code\u003e text, while the 10.21 refusal uses a different libpq wording; neither wording is a fixed 08001 template.\u003c/p\u003e\n\u003ch2\u003eDiagnosis {#diagnosis}\u003c/h2\u003e\n\u003cp\u003eRecord the target host, port, authentication parameters, and complete DETAIL. The selected 18.6/10.21 runs leave the local autocommit session \u003ccode\u003eIDLE\u003c/code\u003e after the refused attempt; a real dblink handle then connects to the runner-owned target, runs remote \u003ccode\u003eSELECT 1\u003c/code\u003e, and is explicitly disconnected. That proves local recovery and handle cleanup, not completion of any remote business transaction.\u003c/p\u003e\n\u003cp\u003eRead the failure stage before retrying. A refused TCP endpoint, DNS or TLS failure, and authentication rejection can all be returned by libpq through this dblink branch, so inspect the dynamic DETAIL rather than classifying from the code alone. If the call runs inside an explicit local transaction, the \u003ccode\u003eERROR\u003c/code\u003e can leave that transaction unusable until \u003ccode\u003eROLLBACK\u003c/code\u003e (or \u003ccode\u003eROLLBACK TO SAVEPOINT\u003c/code\u003e); the autocommit \u003ccode\u003eIDLE\u003c/code\u003e result in the selected case does not imply that an explicit transaction is still usable. The dblink handle belongs to the backend that created it, so check and repair it on that same session or pool member.\u003c/p\u003e\n\u003ch2\u003eResponse {#response}\u003c/h2\u003e\n\u003cp\u003eCorrect the endpoint or connection parameters, open a new handle, and verify a harmless remote probe before sending business work. If the failed request could have crossed a remote boundary, reconcile it before retrying; 08001 alone does not justify replaying a non-idempotent operation.\u003c/p\u003e\n\u003cp\u003eIn autocommit, retrying the connection attempt after correcting the endpoint is a new statement and the owner session can remain usable. In an explicit transaction, first recover the local transaction, then establish and probe a fresh handle; a savepoint is useful only when the surrounding work is deliberately designed to continue. If the remote operation may have reached the target before the local error was reported, reconcile its result before replaying it.\u003c/p\u003e\n\u003ch2\u003eObserved diagnostics {#messages}\u003c/h2\u003e\n\u003cp\u003eThe fixed \u003ccode\u003edblink_connect\u003c/code\u003e branch emits \u003ccode\u003eERROR\u003c/code\u003e with primary \u003ccode\u003ecould not establish connection\u003c/code\u003e and passes a dynamic libpq string as DETAIL (\u003ccode\u003eerrdetail_internal(\u0026#34;%s\u0026#34;, msg)\u003c/code\u003e). In the selected 18.6 run that value was \u003ccode\u003econnection to server at \u0026#34;127.0.0.1\u0026#34;, port 1 failed: Connection refused\u003c/code\u003e followed by libpq\u0026#39;s hint; in the selected 10.21 run it began \u003ccode\u003ecould not connect to server: Connection refused\u003c/code\u003e. Those are run-specific values, not a fixed SQLSTATE message template. Other producers may choose different text; a client-side exception without the server diagnostic is not evidence for this SQLSTATE.\u003c/p\u003e\n\u003cp\u003eThe severity is fixed at \u003ccode\u003eERROR\u003c/code\u003e for this dblink path. The selected local session stayed \u003ccode\u003eIDLE\u003c/code\u003e because the case used autocommit; do not transfer that status to a surrounding explicit transaction or to a remote transaction whose outcome was not observed.\u003c/p\u003e\n\u003ch2\u003eRepresentative case {#case}\u003c/h2\u003e\n\u003cp\u003eThe SQL block creates \u003ccode\u003edblink\u003c/code\u003e, attempts a refused runner-local port, then probes the owner session.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003erunner_host\u003c/code\u003e, \u003ccode\u003erunner_port\u003c/code\u003e, \u003ccode\u003erunner_db\u003c/code\u003e, and \u003ccode\u003erunner_user\u003c/code\u003e are runner placeholders, not literal values for a manual copy. Replace them with a reachable target and a login role that may connect to it; installing/using \u003ccode\u003edblink\u003c/code\u003e and the remote login require the corresponding privileges. Keep the statements on the same owner backend and use the case\u0026#39;s autocommit boundary if you want the selected recovery observation. The trigger is a server-side dblink attempt; it does not execute work on a remote transaction.\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003eCREATE EXTENSION IF NOT EXISTS dblink;\nSELECT dblink_connect(\u0026#39;missing_remote\u0026#39;, \u0026#39;host=127.0.0.1 port=1 dbname=postgres connect_timeout=1\u0026#39;);\nSELECT dblink_connect(\u0026#39;working_remote\u0026#39;, \u0026#39;host=runner_host port=runner_port dbname=runner_db user=runner_user connect_timeout=5\u0026#39;);\nSELECT * FROM dblink(\u0026#39;working_remote\u0026#39;, \u0026#39;SELECT 1\u0026#39;) AS result(value integer);\nSELECT dblink_disconnect(\u0026#39;working_remote\u0026#39;);\nSELECT 1;\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003eThe selected 18.6 run reports SQLSTATE \u003ccode\u003e08001\u003c/code\u003e, primary \u003ccode\u003ecould not establish connection\u003c/code\u003e, and leaves the owner session \u003ccode\u003eIDLE\u003c/code\u003e after the failed operation. The controlled repair opened the named handle with \u003ccode\u003eOK\u003c/code\u003e, returned remote \u003ccode\u003e1\u003c/code\u003e, and disconnected it with \u003ccode\u003eOK\u003c/code\u003e; the final owner probe returned \u003ccode\u003e1\u003c/code\u003e and \u003ccode\u003eIDLE\u003c/code\u003e. The 10.21 selected run passed the same assertions.\u003c/p\u003e\n\u003cp\u003eThe downloadable case and evidence projections are \u003ca href=\"#cases\" rel=\"nofollow\"\u003e\u003ccode\u003e08001 case JSON\u003c/code\u003e\u003c/a\u003e and \u003ca href=\"#sources\" rel=\"nofollow\"\u003e\u003ccode\u003eauthored evidence\u003c/code\u003e\u003c/a\u003e. The runner manifest is \u003ccode\u003everify/cases/08001/cases.json\u003c/code\u003e; the page SQL is checked against its shared registry before publication.\u003c/p\u003e\n\u003ch2\u003eVersions {#versions}\u003c/h2\u003e\n\u003cp\u003eThe generated facts table records the locked catalogue snapshots and earliest observed definition. The selected natural runtime scope is PostgreSQL 18.6 and 10.21; this does not infer behavior for every intermediate release.\u003c/p\u003e\n\u003ch2\u003eRelated {#related}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08000/\" rel=\"nofollow\"\u003e\u003ccode\u003e08000\u003c/code\u003e — connection_exception\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08003/\" rel=\"nofollow\"\u003e\u003ccode\u003e08003\u003c/code\u003e — connection_does_not_exist\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/28000/\" rel=\"nofollow\"\u003e\u003ccode\u003e28000\u003c/code\u003e — invalid_authorization_specification\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/3D000/\" rel=\"nofollow\"\u003e\u003ccode\u003e3D000\u003c/code\u003e — invalid_catalog_name\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003ch2\u003eSources {#sources}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.18.6\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003ee4cfaec3a0a1e5d23fded584725e0f6cf7a17321ad99e5fe046e8b7f97416f15\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L335-L338\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.10.23\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e2d542cc722ba361bd59990aaed7fe7c0f8e147155df5e5fcd56ee03b4dd27c61\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/contrib/dblink/dblink.c#L299-L302\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.calls.REL_18_6\u003c/code\u003e / \u003ccode\u003esrc.calls.REL_10_23\u003c/code\u003e — fixed local call scans, SHA-256 \u003ccode\u003e9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf\u003c/code\u003e / \u003ccode\u003e00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c\u003c/code\u003e; these scans preserve the resolved call context used by the claims.\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:a5abb353e53fa2f90c0570507acb7ee80d6953345afe1e7a1da450ed89d6105a","ContentHash":"efb7f3f48fe54dee0769670f4f46e2c07544d59efed258fca7cf6d8724a44db8","Payload":{"body_md":"# 08001\n\n## At a glance {#at-a-glance}\n\nSQLSTATE `08001` is **sqlclient_unable_to_establish_sqlconnection** in Class `08`. `08001` is the server-side SQLSTATE for a client connection that could not be established. In the selected `dblink_connect` path the ERROR primary is `could not establish connection` and the refused-port reason is dynamic DETAIL; this differs from 08003 (an absent dblink handle) and startup failures such as 28000, 28P01, and 3D000.\n\n\n## Meaning {#meaning}\n\nThe server-side `dblink_connect` branch emits this code after libpq cannot open the requested remote endpoint. Its fixed diagnostic is an ERROR with primary `could not establish connection`; the endpoint and operating-system reason are dynamic DETAIL text. The condition concerns establishing a named remote handle, so it is different from an absent handle (08003) and from startup rejection before a session exists (28000 or 3D000).\n\nThe source does not format the DETAIL itself: `dblink.c` passes the libpq error string through `errdetail_internal(\"%s\", msg)`. That distinction matters when comparing versions or clients. The 18.6 refusal observed below includes the host, port, and `Connection refused` text, while the 10.21 refusal uses a different libpq wording; neither wording is a fixed 08001 template.\n\n## Diagnosis {#diagnosis}\n\nRecord the target host, port, authentication parameters, and complete DETAIL. The selected 18.6/10.21 runs leave the local autocommit session `IDLE` after the refused attempt; a real dblink handle then connects to the runner-owned target, runs remote `SELECT 1`, and is explicitly disconnected. That proves local recovery and handle cleanup, not completion of any remote business transaction.\n\nRead the failure stage before retrying. A refused TCP endpoint, DNS or TLS failure, and authentication rejection can all be returned by libpq through this dblink branch, so inspect the dynamic DETAIL rather than classifying from the code alone. If the call runs inside an explicit local transaction, the `ERROR` can leave that transaction unusable until `ROLLBACK` (or `ROLLBACK TO SAVEPOINT`); the autocommit `IDLE` result in the selected case does not imply that an explicit transaction is still usable. The dblink handle belongs to the backend that created it, so check and repair it on that same session or pool member.\n\n## Response {#response}\n\nCorrect the endpoint or connection parameters, open a new handle, and verify a harmless remote probe before sending business work. If the failed request could have crossed a remote boundary, reconcile it before retrying; 08001 alone does not justify replaying a non-idempotent operation.\n\nIn autocommit, retrying the connection attempt after correcting the endpoint is a new statement and the owner session can remain usable. In an explicit transaction, first recover the local transaction, then establish and probe a fresh handle; a savepoint is useful only when the surrounding work is deliberately designed to continue. If the remote operation may have reached the target before the local error was reported, reconcile its result before replaying it.\n\n## Observed diagnostics {#messages}\n\nThe fixed `dblink_connect` branch emits `ERROR` with primary `could not establish connection` and passes a dynamic libpq string as DETAIL (`errdetail_internal(\"%s\", msg)`). In the selected 18.6 run that value was `connection to server at \"127.0.0.1\", port 1 failed: Connection refused` followed by libpq's hint; in the selected 10.21 run it began `could not connect to server: Connection refused`. Those are run-specific values, not a fixed SQLSTATE message template. Other producers may choose different text; a client-side exception without the server diagnostic is not evidence for this SQLSTATE.\n\nThe severity is fixed at `ERROR` for this dblink path. The selected local session stayed `IDLE` because the case used autocommit; do not transfer that status to a surrounding explicit transaction or to a remote transaction whose outcome was not observed.\n\n## Representative case {#case}\n\n\nThe SQL block creates `dblink`, attempts a refused runner-local port, then probes the owner session.\n\n`runner_host`, `runner_port`, `runner_db`, and `runner_user` are runner placeholders, not literal values for a manual copy. Replace them with a reachable target and a login role that may connect to it; installing/using `dblink` and the remote login require the corresponding privileges. Keep the statements on the same owner backend and use the case's autocommit boundary if you want the selected recovery observation. The trigger is a server-side dblink attempt; it does not execute work on a remote transaction.\n\n```sql\nCREATE EXTENSION IF NOT EXISTS dblink;\nSELECT dblink_connect('missing_remote', 'host=127.0.0.1 port=1 dbname=postgres connect_timeout=1');\nSELECT dblink_connect('working_remote', 'host=runner_host port=runner_port dbname=runner_db user=runner_user connect_timeout=5');\nSELECT * FROM dblink('working_remote', 'SELECT 1') AS result(value integer);\nSELECT dblink_disconnect('working_remote');\nSELECT 1;\n```\n\n\nThe selected 18.6 run reports SQLSTATE `08001`, primary `could not establish connection`, and leaves the owner session `IDLE` after the failed operation. The controlled repair opened the named handle with `OK`, returned remote `1`, and disconnected it with `OK`; the final owner probe returned `1` and `IDLE`. The 10.21 selected run passed the same assertions.\n\nThe downloadable case and evidence projections are [`08001 case JSON`](#cases) and [`authored evidence`](#sources). The runner manifest is `verify/cases/08001/cases.json`; the page SQL is checked against its shared registry before publication.\n\n## Versions {#versions}\n\nThe generated facts table records the locked catalogue snapshots and earliest observed definition. The selected natural runtime scope is PostgreSQL 18.6 and 10.21; this does not infer behavior for every intermediate release.\n\n## Related {#related}\n\n- [`08000` — connection_exception](/wiki/sqlstate/08000/)\n- [`08003` — connection_does_not_exist](/wiki/sqlstate/08003/)\n- [`28000` — invalid_authorization_specification](/wiki/sqlstate/28000/)\n- [`3D000` — invalid_catalog_name](/wiki/sqlstate/3D000/)\n\n## Sources {#sources}\n\n- `src.dblink-connect.18.6` — `contrib/dblink/dblink.c` at `REL_18_6` commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`; fixed blob SHA-256 `e4cfaec3a0a1e5d23fded584725e0f6cf7a17321ad99e5fe046e8b7f97416f15` ([source](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L335-L338)).\n- `src.dblink-connect.10.23` — `contrib/dblink/dblink.c` at `REL_10_23` commit `02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4`; fixed blob SHA-256 `2d542cc722ba361bd59990aaed7fe7c0f8e147155df5e5fcd56ee03b4dd27c61` ([source](https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/contrib/dblink/dblink.c#L299-L302)).\n- `src.calls.REL_18_6` / `src.calls.REL_10_23` — fixed local call scans, SHA-256 `9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf` / `00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c`; these scans preserve the resolved call context used by the claims.\n","description":"PostgreSQL SQLSTATE 08001: sqlclient_unable_to_establish_sqlconnection, source-backed diagnosis and recovery guidance.","is_stale":false,"name":"","sections":[{"anchor":"","heading":"","html":"\u0026lt;h1\u0026gt;08001\u0026lt;/h1\u0026gt;"},{"anchor":"at-a-glance","heading":"At a glance","html":"\u003cp\u003eSQLSTATE \u003ccode\u003e08001\u003c/code\u003e is \u003cstrong\u003esqlclient_unable_to_establish_sqlconnection\u003c/strong\u003e in Class \u003ccode\u003e08\u003c/code\u003e. \u003ccode\u003e08001\u003c/code\u003e is the server-side SQLSTATE for a client connection that could not be established. In the selected \u003ccode\u003edblink_connect\u003c/code\u003e path the ERROR primary is \u003ccode\u003ecould not establish connection\u003c/code\u003e and the refused-port reason is dynamic DETAIL; this differs from 08003 (an absent dblink handle) and startup failures such as 28000, 28P01, and 3D000.\u003c/p\u003e"},{"anchor":"meaning","heading":"Meaning","html":"\u003cp\u003eThe server-side \u003ccode\u003edblink_connect\u003c/code\u003e branch emits this code after libpq cannot open the requested remote endpoint. Its fixed diagnostic is an ERROR with primary \u003ccode\u003ecould not establish connection\u003c/code\u003e; the endpoint and operating-system reason are dynamic DETAIL text. The condition concerns establishing a named remote handle, so it is different from an absent handle (08003) and from startup rejection before a session exists (28000 or 3D000).\u003c/p\u003e\n\u003cp\u003eThe source does not format the DETAIL itself: \u003ccode\u003edblink.c\u003c/code\u003e passes the libpq error string through \u003ccode\u003eerrdetail_internal(\"%s\", msg)\u003c/code\u003e. That distinction matters when comparing versions or clients. The 18.6 refusal observed below includes the host, port, and \u003ccode\u003eConnection refused\u003c/code\u003e text, while the 10.21 refusal uses a different libpq wording; neither wording is a fixed 08001 template.\u003c/p\u003e"},{"anchor":"diagnosis","heading":"Diagnosis","html":"\u003cp\u003eRecord the target host, port, authentication parameters, and complete DETAIL. The selected 18.6/10.21 runs leave the local autocommit session \u003ccode\u003eIDLE\u003c/code\u003e after the refused attempt; a real dblink handle then connects to the runner-owned target, runs remote \u003ccode\u003eSELECT 1\u003c/code\u003e, and is explicitly disconnected. That proves local recovery and handle cleanup, not completion of any remote business transaction.\u003c/p\u003e\n\u003cp\u003eRead the failure stage before retrying. A refused TCP endpoint, DNS or TLS failure, and authentication rejection can all be returned by libpq through this dblink branch, so inspect the dynamic DETAIL rather than classifying from the code alone. If the call runs inside an explicit local transaction, the \u003ccode\u003eERROR\u003c/code\u003e can leave that transaction unusable until \u003ccode\u003eROLLBACK\u003c/code\u003e (or \u003ccode\u003eROLLBACK TO SAVEPOINT\u003c/code\u003e); the autocommit \u003ccode\u003eIDLE\u003c/code\u003e result in the selected case does not imply that an explicit transaction is still usable. The dblink handle belongs to the backend that created it, so check and repair it on that same session or pool member.\u003c/p\u003e"},{"anchor":"response","heading":"Response","html":"\u003cp\u003eCorrect the endpoint or connection parameters, open a new handle, and verify a harmless remote probe before sending business work. If the failed request could have crossed a remote boundary, reconcile it before retrying; 08001 alone does not justify replaying a non-idempotent operation.\u003c/p\u003e\n\u003cp\u003eIn autocommit, retrying the connection attempt after correcting the endpoint is a new statement and the owner session can remain usable. In an explicit transaction, first recover the local transaction, then establish and probe a fresh handle; a savepoint is useful only when the surrounding work is deliberately designed to continue. If the remote operation may have reached the target before the local error was reported, reconcile its result before replaying it.\u003c/p\u003e"},{"anchor":"messages","heading":"Observed diagnostics","html":"\u003cp\u003eThe fixed \u003ccode\u003edblink_connect\u003c/code\u003e branch emits \u003ccode\u003eERROR\u003c/code\u003e with primary \u003ccode\u003ecould not establish connection\u003c/code\u003e and passes a dynamic libpq string as DETAIL (\u003ccode\u003eerrdetail_internal(\"%s\", msg)\u003c/code\u003e). In the selected 18.6 run that value was \u003ccode\u003econnection to server at \"127.0.0.1\", port 1 failed: Connection refused\u003c/code\u003e followed by libpq's hint; in the selected 10.21 run it began \u003ccode\u003ecould not connect to server: Connection refused\u003c/code\u003e. Those are run-specific values, not a fixed SQLSTATE message template. Other producers may choose different text; a client-side exception without the server diagnostic is not evidence for this SQLSTATE.\u003c/p\u003e\n\u003cp\u003eThe severity is fixed at \u003ccode\u003eERROR\u003c/code\u003e for this dblink path. The selected local session stayed \u003ccode\u003eIDLE\u003c/code\u003e because the case used autocommit; do not transfer that status to a surrounding explicit transaction or to a remote transaction whose outcome was not observed.\u003c/p\u003e"},{"anchor":"case","heading":"Representative case","html":"\u003cp\u003eThe SQL block creates \u003ccode\u003edblink\u003c/code\u003e, attempts a refused runner-local port, then probes the owner session.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003erunner_host\u003c/code\u003e, \u003ccode\u003erunner_port\u003c/code\u003e, \u003ccode\u003erunner_db\u003c/code\u003e, and \u003ccode\u003erunner_user\u003c/code\u003e are runner placeholders, not literal values for a manual copy. Replace them with a reachable target and a login role that may connect to it; installing/using \u003ccode\u003edblink\u003c/code\u003e and the remote login require the corresponding privileges. Keep the statements on the same owner backend and use the case's autocommit boundary if you want the selected recovery observation. The trigger is a server-side dblink attempt; it does not execute work on a remote transaction.\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"language-sql\"\u003eCREATE EXTENSION IF NOT EXISTS dblink;\nSELECT dblink_connect('missing_remote', 'host=127.0.0.1 port=1 dbname=postgres connect_timeout=1');\nSELECT dblink_connect('working_remote', 'host=runner_host port=runner_port dbname=runner_db user=runner_user connect_timeout=5');\nSELECT * FROM dblink('working_remote', 'SELECT 1') AS result(value integer);\nSELECT dblink_disconnect('working_remote');\nSELECT 1;\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003eThe selected 18.6 run reports SQLSTATE \u003ccode\u003e08001\u003c/code\u003e, primary \u003ccode\u003ecould not establish connection\u003c/code\u003e, and leaves the owner session \u003ccode\u003eIDLE\u003c/code\u003e after the failed operation. The controlled repair opened the named handle with \u003ccode\u003eOK\u003c/code\u003e, returned remote \u003ccode\u003e1\u003c/code\u003e, and disconnected it with \u003ccode\u003eOK\u003c/code\u003e; the final owner probe returned \u003ccode\u003e1\u003c/code\u003e and \u003ccode\u003eIDLE\u003c/code\u003e. The 10.21 selected run passed the same assertions.\u003c/p\u003e\n\u003cp\u003eThe downloadable case and evidence projections are \u003ca href=\"#cases\"\u003e\u003ccode\u003e08001 case JSON\u003c/code\u003e\u003c/a\u003e and \u003ca href=\"#sources\"\u003e\u003ccode\u003eauthored evidence\u003c/code\u003e\u003c/a\u003e. The runner manifest is \u003ccode\u003everify/cases/08001/cases.json\u003c/code\u003e; the page SQL is checked against its shared registry before publication.\u003c/p\u003e"},{"anchor":"versions","heading":"Versions","html":"\u003cp\u003eThe generated facts table records the locked catalogue snapshots and earliest observed definition. The selected natural runtime scope is PostgreSQL 18.6 and 10.21; this does not infer behavior for every intermediate release.\u003c/p\u003e"},{"anchor":"related","heading":"Related","html":"\u003cul\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08000/\"\u003e\u003ccode\u003e08000\u003c/code\u003e — connection_exception\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08003/\"\u003e\u003ccode\u003e08003\u003c/code\u003e — connection_does_not_exist\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/28000/\"\u003e\u003ccode\u003e28000\u003c/code\u003e — invalid_authorization_specification\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/3D000/\"\u003e\u003ccode\u003e3D000\u003c/code\u003e — invalid_catalog_name\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e"},{"anchor":"sources","heading":"Sources","html":"\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.18.6\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003ee4cfaec3a0a1e5d23fded584725e0f6cf7a17321ad99e5fe046e8b7f97416f15\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L335-L338\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.10.23\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e2d542cc722ba361bd59990aaed7fe7c0f8e147155df5e5fcd56ee03b4dd27c61\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/contrib/dblink/dblink.c#L299-L302\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.calls.REL_18_6\u003c/code\u003e / \u003ccode\u003esrc.calls.REL_10_23\u003c/code\u003e — fixed local call scans, SHA-256 \u003ccode\u003e9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf\u003c/code\u003e / \u003ccode\u003e00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c\u003c/code\u003e; these scans preserve the resolved call context used by the claims.\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"SQLSTATE 08001 is sqlclient_unable_to_establish_sqlconnection in Class 08. 08001 is the server-side SQLSTATE for a client connection that could not be established. In the selected dblink_connect path the ERROR primary is could not establish connection and the refused-port reason is dynamic DETAIL; this differs from 08003 (an absent dblink handle) and startup failures such as 28000, 28P01, and 3D000.","title":"08001 — sqlclient_unable_to_establish_sqlconnection","translation_source_rev":"bcac95176c2fe7f0d391146b91b48908b4102477689518a4b084f13b7858045d"}},"RequestedLocale":"en","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","8.1","8.2","8.3","8.4","9.0","9.1","9.2","9.3","9.4","9.5","9.6"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":{"aliases":[],"catalogue_notes":{"earliest_observed":"7.4","formal_scope":"9.0.0..18.6","latest_observed":"18.6","matrix_scope":["9.0.23","9.1.24","9.2.24","9.3.25","9.4.26","9.5.25","9.6.24","10.23","11.22","12.22","13.23","14.24","15.19","16.15","17.11","18.6"],"pre9_scope":{"formal_tag_count":191,"maximum_release":"8.4.22","minimum_release":"7.0.0","source_definition_count":153,"source_doc_count":153,"source_file_count":306,"source_scope":"7.4..8.4 definition files; 7.0..7.3 candidate-path source gap probes","source_tag_count":153},"pre9_status":"present","preview_scope":["19beta3"]},"class":"08","class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","condition_names":["sqlclient_unable_to_establish_sqlconnection"],"definition_changes":[],"english_manuals":{"10":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"9607b57e9f639b61785677ba4d226f5889fe1d19c8bf55a3337691899a9073cd","slug":"10"},"lang":"en","sqlstate":"08001"},"11":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"3a024e38263ad77de228eed7930b842b42dc1d5cab9ca3727be8eed872ec9539","slug":"11"},"lang":"en","sqlstate":"08001"},"12":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1444bd6a138537cd75be88a220ee9472ac528f0cfc58758e49636d85455efe98","slug":"12"},"lang":"en","sqlstate":"08001"},"13":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"4a3ef8af218e5736dfde8660ba609e84233b6b3bac7e0210ff8724cf1b27b2db","slug":"13"},"lang":"en","sqlstate":"08001"},"14":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1c12e83304e0f4ff64c9d98ca5e3007df6756932ed19867a4fa0e0650f6c5751","slug":"14"},"lang":"en","sqlstate":"08001"},"15":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2161f58f6e87f6535b3b1f3d4661427bb6765f4f6b074fcc16fac97594b50599","slug":"15"},"lang":"en","sqlstate":"08001"},"16":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"928e705933d7c3d018ae3fba9d800b34e6325746d157339dce878473c519d100","slug":"16"},"lang":"en","sqlstate":"08001"},"17":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"868135520af87351e3ea1ba42656111cbd2d157d98e1fef05ea158ac5729d8b1","slug":"17"},"lang":"en","sqlstate":"08001"},"18":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"08001"},"19":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"63fb8d1aa9f494eeab9d0f8542a2b673f7746ee41ae2689d19403cb3cc425a5c","slug":"19"},"lang":"en","sqlstate":"08001"},"20":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"0d3f602127cd137cf343b32d5fa78f175eeb6cdcb6353b1f6f998ede6cb7b911","slug":"devel"},"lang":"en","sqlstate":"08001"},"8.1":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"0177b8818643540dec7bbef1fe92b60a3961debd52a68412301647ca146c7f2d","slug":"8.1"},"lang":"en","sqlstate":"08001"},"8.2":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"d65bf7cff5958c304352c974e477183e21efe9bd68e03786001874653bf66963","slug":"8.2"},"lang":"en","sqlstate":"08001"},"8.3":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"118059002973cdec5466ed3cabe7c9370b4c93d8ab542b8661d0eeb50cf6950d","slug":"8.3"},"lang":"en","sqlstate":"08001"},"8.4":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"d63b10001be0581484022e33b78124a36bb3bd68d3ebe022cd7dfb375233432f","slug":"8.4"},"lang":"en","sqlstate":"08001"},"9.0":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"658fc09c4c10eed7ac7dea4ed3e3eff8cc5791eb5af26b7b4a31b0f863b316db","slug":"9.0"},"lang":"en","sqlstate":"08001"},"9.1":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2d118b06c3b644c28b3ddefe9e4bef99a180321582209332372a5318f5bf8d1c","slug":"9.1"},"lang":"en","sqlstate":"08001"},"9.2":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2a37575b39c858d37c58fc4de6a16109554fd3306602294180d78faa1170d2cd","slug":"9.2"},"lang":"en","sqlstate":"08001"},"9.3":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2214b6869d764f7fba7221aefcdf1ab049b55ad51d63aa52054f3cd2c2533ae9","slug":"9.3"},"lang":"en","sqlstate":"08001"},"9.4":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"7243e2d653befe88733222ede67958f0c4b7fae967b58eb97807aeb3f32b4096","slug":"9.4"},"lang":"en","sqlstate":"08001"},"9.5":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"d40bc67cb331f1e4ccc0821ff57832c6c230edb0dce3ba4249defd21ae7ea29d","slug":"9.5"},"lang":"en","sqlstate":"08001"},"9.6":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2ab55e487571c8998ec39b3d1bbae29ac6fc5c310875bee422d9a7b8b3fde5b3","slug":"9.6"},"lang":"en","sqlstate":"08001"}},"history_boundary":{"earliest_observed":"7.4","formal_tag_count":351,"gaps":[{"after":"18.6","before":"18.4","reason":"Non-adjacent release tags or a source gap; no removal is inferred."}],"latest_observed":"18.6","pre_range":{"first_observed":"7.4","known_lower_bound":"7.4 or earlier","last_observed":"8.4.22","notes":"Observed in the locked pre-9 formal release source; the label is a proven 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in a PostgreSQL release definition file is established; runtime throw/use scanning is maintained 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old definition path and same-tag documentation were locked for the observed 7.4..8.4 tags; this is a definition presence bound, not a runtime path or precise introducing commit.","scope":"pre9-definition-history","status":"definition_only"}]},"Evidence":[{"Kind":"cases","Ordinal":0,"ID":"dblink_connect_failure","ServerVersion":null,"Status":null,"Payload":{"assertions":["The selected server diagnostic has the expected SQLSTATE","The selected recovery/probe assertions pass","Runner-owned resources are cleaned up"],"case_id":"dblink_connect_failure","cleanup":"Drop the case schema with an owner connection.","has_snippet":true,"position":0,"preconditions":["A runner-owned disposable target is provisioned."],"repair":"Follow the case-specific repair statements and verify the resulting state.","trigger":"Connect to a runner-local refused port through server-side 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