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SEC_E_UNSUPPORTED_FUNCTION
SEC_E_UNSUPPORTED_FUNCTION signals this condition: The requested SSPI function or security-context option is not supported by the selected package. The application requested a feature that the chosen security package cannot provide. In CredSSP scenarios, Microsoft notes that this can result from an invalid context-request flag.
What to check
- Log the selected security package and all requested context flags at the failing call.
- Compare the requested feature, such as delegation, confidentiality, or mutual authentication, with the package actually negotiated.
- Do not treat this as a domain-controller outage until the application request has been validated.
Microsoft: InitializeSecurityContext for CredSSP
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