I have 3 Server 2008R2 fully patched domain controllers on site. The problem is that when I reboot the PDC (DC1) it takes a very long time before he starts up again.
DC1 is the DC with the problem, DC2 is a secondary DC:
In the event log I see that this is because of DNS problems. I have the IP of the DC1 as primary nameserver, the IP of another DC as secondary and the localhost adres as third.
When the DC comes up (after a while) I can't ping the other DC's where the secundary nameservers are located (not on IP and not on their name) but I can ping client computers.
Only after like 30 minutes or so or if I manually restart the DNS service on the DC1 connectivity restores and I can ping everything and all services that previously failed because of dns problems are coming back online.
So ofcourse DNS doesn't work because he can't get connectivity to the other nameservers. The problem is that I have no clue why this is. And even weirder is why the connectivity (also on IP) returns when I restart the dns service. (I would think that IP ping would work regardless of the DNS service)
Dcdiag doesn't show any errors and I can't find anything that could be a cause in the event viewer.
Does anyone have an idea?