Additional info:

kdc.conf includes:

           master_key_type = des-cbc-crc
           supported_enctypes = des-cbc-crc:normal des:normal des:v4
des:norealm des:onlyrealm des:afs3 des-cbc-crc:v4

krb5.conf on the kdc includes:

         default_tgs_enctypes = des-cbc-crc
         default_tkt_enctypes = des-cbc-crc 

the krbtgt/REALM@REALM has one key:

          Key: vno 2, DES cbc mode with CRC-32, Version 4