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WU_E_INFRASTRUCTUREFILE_REQUIRES_SSL
WU_E_INFRASTRUCTUREFILE_REQUIRES_SSL means Windows Update rejected a transport path that did not meet the security requirement for the infrastructure file. Changing the local cache cannot make an insecure route acceptable.
What to check
- Verify that the update service and any WSUS or proxy endpoint use the required secure HTTPS configuration.
- Check for TLS interception, redirection, or downgrade behavior that alters the expected secure connection.
- Confirm the system clock and certificate-validation path before modifying update-service policy.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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