Communication failure with server while initializing kadmin interface
The host that was specified for the admin server, also called the master KDC, did not have the kadmind daemon running.
Make sure that you specified the correct host name for the master KDC. If you specified the correct host name, make sure that kadmind is running on the master KDC that you specified.
Please restart your kadmin
sudo service krb5-admin-server restart
and verify the port 749 is used:
netstat -alnt | egrep ':88|:464|:749'