Set the server keytab in the startup script for the auth server.

files/auth/start.sh

 #!/bin/bash
 
+# Set the keytab. Otherwise, it won't find the appropriate keys.
+export KRB5_KTNAME=$(pwd)/keys/kerberos.keytab
+
 if grep "aes-devel" /etc/hostname > /dev/null
 then
     # Allow debug auth when on the devel system.