08000ERRORTier 2 — Caution✅ HIGH confidence

connection exception

Category: Connection ExceptionVersions: All Postgres versions

What this means

SQLSTATE 08000 is the generic connection exception code. It is raised when a connection-level error occurs that does not map to a more specific 08xxx subcode. The connection may be in an unusable state after this error.

Why it happens

1Network interruption between client and Postgres server
2Server-side connection reset not covered by a more specific code
3Protocol-level error during connection setup or teardown

How to reproduce

Network fault between application server and Postgres.

trigger — this will ERROR

ERROR: connection exception

Fix 1: Implement connection retry with exponential backoff

When transient network faults cause 08000 errors.

fix

Why this works

Close the failed connection, wait briefly, then obtain a new connection from the pool. Do not reuse a connection that raised 08000.

Fix 2: Use a connection pool with health checks

In production applications.

fix

Why this works

Connection pools like PgBouncer or pg-pool test connections before handing them to the application, evicting broken connections automatically.

What not to do

✗

Retry on the same connection object

Why it's wrong: A connection that raised 08000 is in an undefined state and must be replaced.

Sources

📚 Official docs: https://www.postgresql.org/docs/current/errcodes-appendix.html

🔧 Source ref: Class 08 — Connection Exception

Confidence assessment

✅ HIGH confidence

Standard SQLSTATE connection exception class. Behaviour consistent across all versions.