| Previous | Next |
| WU_E_PT_ENDPOINTURL_NOTAVAIL | WU_E_PT_INVALID_OPERATION |
WU_E_PT_ENDPOINT_DISCONNECTED
WU_E_PT_ENDPOINT_DISCONNECTED means that an established connection died before the protocol operation completed. Investigate connection interruption, not merely the final update result.
What to check
- Look for a proxy, firewall, VPN, load balancer, or server restart that can close an idle or long-running connection.
- Compare the failure time with server-side IIS, WSUS, proxy, and network-device logs.
- Retry once after the connection path is stable; a recurring failure should be investigated at the transport layer.
Microsoft: WUA networking error codes
Microsoft: Windows Update troubleshooting
Looking for a different code? Search another status or error code.