HRESULT 0x8024401B (WU_E_PT_HTTP_STATUS_PROXY_AUTH

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Description:

The update request was stopped by an HTTP proxy that requires authentication.

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WU_E_PT_HTTP_STATUS_BAD_METHOD	WU_E_PT_HTTP_STATUS_REQUEST_TIMEOUT

WU_E_PT_HTTP_STATUS_PROXY_AUTH_REQ

WU_E_PT_HTTP_STATUS_PROXY_AUTH_REQ maps to HTTP 407 Proxy Authentication Required. The client reached the proxy, but the proxy did not accept the authentication available to the system-level update client.

What to check

Inspect the WinHTTP proxy and bypass configuration used by Windows Update.
Make sure the proxy policy supports the update client context and required endpoints.
Review proxy logs for the authentication challenge and the identity or scheme that was rejected.

netsh winhttp show proxy

Microsoft: Windows Update proxy selection

Microsoft: WUA networking error codes

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