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WU_E_PT_NO_AUTH_PLUGINS_REQUESTED
WU_E_PT_NO_AUTH_PLUGINS_REQUESTED means the server did not provide any authentication information that the Windows Update Agent could use. This is a server-side protocol or authentication-configuration problem, not merely a bad password.
What to check
- Inspect WSUS, IIS, and proxy authentication settings for the endpoint serving the request.
- Check the response and server logs to determine whether an intermediary removed or altered authentication headers.
- Compare a failing client with a working client that uses the same service and network path.
Microsoft: WSUS messages and troubleshooting tips
Microsoft: Windows Update proxy selection
Microsoft: Windows Update error reference
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