Check Processes

ps -ef |grep krb
root 7097 1 0 13:52 ? 00:00:00 /usr/lib/mit/sbin/krb5kdc
ps -ef |grep kadmin
root 7109 1 0 13:52 ? 00:00:00 /usr/lib/mit/sbin/kadmind
If these aren't running, there may be a problem. Check the logfiles in this case!