ProxySQL Error Codes
ProxySQL uses the following custom error codes:
| Error | Message |
|---|---|
| 9001 | Max connect timeout reached while reaching hostgroup %d after %llums |
| 9002 | Max connect failure while reaching hostgroup %d |
| 9003 | Command not supported |
| 9004 | Backend Offline Detected |
| 9006 | Connection is locked to hostgroup X but trying to reach hostgroup Y |
Error Descriptions
Error 9001 — Indicates a connection timeout when attempting to reach a specified hostgroup.
Error 9002 — Signals that the maximum number of connection failures to a hostgroup has been exceeded.
Error 9003 — Returned when ProxySQL receives an unsupported command (e.g., INSERT VALUES
via the ClickHouse interface).
Error 9004 — ProxySQL identified a backend server as unavailable before attempting to use a connection. The proxy detected the issue through monitoring mechanisms rather than a failed connection attempt.
Error 9006 — Occurs when a connection bound to one hostgroup attempts to access a different hostgroup.