I have a problem with my servers being in sync. This started to happen
this morning. The primary time server can reach the NTP site which is
time.windows.com (if anybody else has another one to use then please let
me know) but it is saying: NTP Source Not in Sync. Discarding the packet.
*** Unable to communicate with server! ***

It seems to be complaining about not communicating with itself. What
diagnosing steps can be taken? Any good documentation?

Thanks for any guidance.