Today I tried to update one of our Keycloaks from version 12 to 18. Everything looked good except Kerberos login. I am using the exact same keytab file I used in KC version 12 but in version 18 I do get this:

May 24 23:18:36 kc001.linux.mydomain.at kc.sh[8164]: 2022-05-24 23:18:36,996 WARN [org.keycloak.federation.kerberos.impl.SPNEGOAuthenticator] (executor-thread-2) SPNEGO login failed: java.security.PrivilegedActionException: GSSException: Failure unspecified at GSS-API level (Mechanism level: Checksum failed)

Any ideas what might be the cause?

Cheers,
Ronald
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