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WU_E_PT_ENDPOINT_UNREACHABLE
WU_E_PT_ENDPOINT_UNREACHABLE indicates that there was no usable route or network connectivity to the service endpoint. It does not by itself distinguish DNS, proxy, firewall, or a server outage.
How to investigate
- Determine the configured update endpoint first; in managed environments this can be an intranet WSUS server rather than the public Windows Update service.
- Check name resolution, routing, firewall policy, and the system WinHTTP proxy for that exact endpoint.
- Capture the nearby Windows Update log entries: a more specific nested WinHTTP or HTTP status often identifies the failing layer.
Microsoft: WUA networking error codes
Microsoft: Windows Update log files
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