System diagnostic reported KDCs were unreachable

This is my first time installation of UCS Version 4.4-0 errata0 (Blumenthal).
When I run system diagnostic I am getting Critical KDC service check
The following KDCs were unreachable: tcp ucsa.koch.intranet:88, udp ucsa.koch.intranet:88

How I can fix this ?

hi vijayrana , have you solved this?
I also have the same problem, please help me