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WU_E_PT_SECURITY_SYSTEM_FAILURE
WU_E_PT_SECURITY_SYSTEM_FAILURE signals a security-layer failure during Windows Update communication. It is broader than a simple HTTP authorization response and should be investigated with the related certificate, authentication, and proxy evidence.
What to verify
- Check the system clock and certificate-validation path first.
- Review whether a proxy or TLS-inspection device changes the connection to the configured update service.
- Use the earlier HRESULT and the server-side log to distinguish client authentication, server configuration, and transport interception.
Microsoft: WUA networking error codes
Microsoft: Windows Update security
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