Authentication issues when using single sign-on (SSO).
Expired Kerberos Domain Controller certificate (intended purpose: KDC Authentication).
- On each Microsoft Windows Kerberos Domain Controller, press [Win] + R.
- Enter certlm.msc and press [OK] to launch the management console showing the certificates of the local computer.
- Navigate to Personal > Certificates.
- Check that you have a valid KDC Authentication Certificate for each Domain Controller (it should be listed under the "Intended purposes" column).
Make sure the certificate exists and that it has not expired. If it is expired or missing, the Domain Controller needs to be issued a new certificate for KDC Authentication.
Note: if there were other certificates being used by the KDCs, it may be necessary to restart the "Kerberos Key Distribution Center" service on the Microsoft Windows Server to make sure the Kerberos service uses the new certificate.
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