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08001

PostgreSQL 08001: sqlclient_unable_to_establish_sqlconnection

Verified with sources3 sourcesReviewed Aug 23, 2026
Trace

Evidence linked to this decision

View source: PostgreSQL 18 Appendix A: Error Codes

Risk level

Medium

Proceed carefully and stop if the check is unclear.

Urgency

Medium

Quick answer

SQLSTATE 08001 (sqlclient_unable_to_establish_sqlconnection) means the client could not establish a PostgreSQL connection. Diagnose the named condition before retrying.

Safety first

Safe checks you can perform

  • Verify the endpoint from the failing runtime

What a technician must be able to justify

A technician is coming

These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.

These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.

    Before accepting a part or repair

    Nothing has been shown yet. Do not accept a part swap based on the code alone.

    Follow these steps

    Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

    1. Verify the endpoint from the failing runtime

      Tools required

      From the same container or host, resolve the configured hostname and test the configured port, then compare host, port, dbname, sslmode and certificate path with the deployed secret. If the port is closed, inspect service readiness and routing; if it opens, keep the exact libpq error and inspect TLS or authentication next.

      Evidence: PostgreSQL 18 Appendix A: Error Codes · PostgreSQL error and notice fields · PostgreSQL database connection control functions

    Still not solved

    If the error persists, stop here. See what the technician must do and show you.

    Virtual technician

    Does 08001 still appear after these checks?

    This guided flow uses the exact code and your answers to choose a test, an expected result and the next branch.

    Where this code applies

    A code is meaningful only inside the right product and version context.

    Primary scope

    System
    Software and systems
    Brand
    PostgreSQL
    Product type
    Database

    Known code variants

    • PostgreSQL 08001
    • sqlclient_unable_to_establish_sqlconnection
    • SQLSTATE 08001

    What it means

    PostgreSQL assigns 08001 to sqlclient_unable_to_establish_sqlconnection in Class 08 — Connection Exception. Applications should branch on the stable SQLSTATE and structured error fields, not localized message text.

    Symptoms and causes

    Probable causes · in order

    • Likely trigger in this requestCommon

      The target host, port, DNS result, TLS parameters, database name or listening service does not match a reachable PostgreSQL endpoint.

      Evidence: PostgreSQL 18 Appendix A: Error Codes · PostgreSQL error and notice fields · PostgreSQL database connection control functions

    Sources and technical references

    1. 1

      PostgreSQL 18 Appendix A: Error Codes

      PostgreSQL Global Development Group · 2026 · official_doc

    2. 2

      PostgreSQL error and notice fields

      PostgreSQL Global Development Group · 2026 · official_doc

    3. 3

      PostgreSQL database connection control functions

      PostgreSQL Global Development Group · 2026 · official_doc

    Sources: PostgreSQL 18 Appendix A: Error Codes · PostgreSQL error and notice fields · PostgreSQL database connection control functionsreviewed 2026-08-23 · verified

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