protocol violation
SQLSTATE 08P01 is a Postgres-specific error raised when the client sends a message that violates the Postgres wire protocol. This indicates a bug in the client library, proxy, or connection pooler rather than in the SQL itself.
- 1Client library bug sending malformed protocol messages
- 2Misconfigured connection pooler sending protocol messages in the wrong order
- 3Man-in-the-middle proxy corrupting the Postgres wire protocol
- 4Version mismatch between client library and server protocol expectations
Misconfigured pgBouncer or buggy client driver.
expected output
ERROR: protocol violation
Fix 1
Update the client library to a supported version
WHEN When the error follows a client library or driver upgrade.
Why this works
Outdated drivers may not support newer server protocol messages. Upgrading to the current stable driver version resolves protocol mismatches.
Fix 2
Check PgBouncer or proxy configuration
WHEN When a connection pooler sits between the client and Postgres.
Why this works
Ensure the pooler protocol mode (session/transaction/statement) is compatible with how the application uses the connection. Some protocol extensions are not supported in transaction-mode pooling.
Class 08 — Connection Exception (Postgres-specific)
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