HRESULT 0x8024043C (WU_E_PT_PROXY_AUTH_SCHEME_NOT

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Description:

The configured proxy requires an authentication scheme Windows Update cannot use.

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WU_E_PT_NWS_NOT_LOADED	WU_E_SERVICEPROP_NOTAVAIL

WU_E_PT_PROXY_AUTH_SCHEME_NOT_SUPPORTED

WU_E_PT_PROXY_AUTH_SCHEME_NOT_SUPPORTED means that the update client reached a proxy but cannot authenticate with the scheme it offered. A browser working for an interactive user does not prove that the system-level Windows Update client can authenticate.

What to change

Inspect the system WinHTTP configuration, not only the per-user browser proxy settings.
Ask the proxy administrator to allow the update route without unsupported interactive authentication, or to offer an authentication method supported by the service account context.
Do not repeatedly reset the Windows Update cache; the failure occurs before update metadata can be retrieved.

netsh winhttp show proxy

Microsoft: Windows Update proxy selection

Microsoft: netsh winhttp commands

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