Cannot connect to MIT KDC admin server when port is specified in kerberos-env/admin_server_host. The following error is seen when validating the KDC admin credentials:
The reason for this is due to how the credentials are created for accessing the MIT KDC administration server.
If a port was added to the kerberos-env/admin_server_host value then the server principal will be generated like kadmin/kdc.example.com:4749 rather than kadmin/kdc.example.com. Therefore the server principal is not found.