| Previous | Next |
| WU_E_PT_HTTP_STATUS_BAD_GATEWAY | WU_E_PT_HTTP_STATUS_GATEWAY_TIMEOUT |
WU_E_PT_HTTP_STATUS_SERVICE_UNAVAIL
WU_E_PT_HTTP_STATUS_SERVICE_UNAVAIL maps to HTTP 503: the service is temporarily unavailable or overloaded. The appropriate response is to investigate availability and retry after the service recovers, rather than repeatedly clearing client state.
What to check
- Check whether the service, WSUS application pool, database, or an upstream dependency is overloaded or stopped.
- Compare the failure across multiple clients and network locations.
- Retry with sensible backoff after confirming the service path is healthy.
Microsoft: WUA networking error codes
Microsoft: troubleshoot WSUS connection failures
Looking for a different code? Search another status or error code.