This error is generally returned by application servers when they can't find
a keytab. Make sure you've created a keytab for the service in question.

Note that in pre-1.0 releases of Kerberos 5, the keytab was called
/etc/v5srvtab, but it got renamed to /etc/krb5.keytab for the 1.0 release.
If you're running a pre-1.0 release of Kerberos 5, you'll need to deal with
this when you upgrade.

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