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SEC_E_UNKNOWN_CREDENTIALS
SEC_E_UNKNOWN_CREDENTIALS signals this condition: The credentials presented to the security package were not recognized. The active package could not map the supplied credentials to a valid identity. The cause can be different for password, certificate, Kerberos-ticket, and service-account authentication.
What to check
- Determine the credential type and security package used for the failing attempt.
- Check the account, certificate, or service identity in the relevant event logs rather than collecting or exposing secrets in application logs.
- For Kerberos, verify DNS, time, and domain-controller reachability before assuming the credentials themselves are invalid.
Microsoft: Kerberos authentication troubleshooting
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