kadmin: GSS-API (or Kerberos) error while initializing kadmin interface

[RCU]

Hi,

Can anyone shed some light on what this error means?

# kinit kadmin/admin
Password for kadmin/admin at REALM.COM: 
# kadmin
Authenticating as principal kadmin/admin at REALM.COM with password.
Enter password:
kadmin: GSS-API (or Kerberos) error while initializing kadmin interface

In other words, I can kinit successfully, but can't enter kadmin as the
kadmin/admin user.

I tried exporting a keytab and using it instead, and got the same GSS-API
error.

Thanks for any tips!