We got an existing Windows 2003 domain with 3 DC's and 2 DHCP Server (running on two DC's), so pure Microsoft and nothing else. Everything was working fine until we installed a fourth DC which is a Windows 2008 Server.
Since we got the Windows 2008 Domain Controller, some DHCP Clients cannot register their DNS entries. Please note that the Windows 2008 DC is configured standard we didn't change anything. The clients are linux thin clients which receive an IP from one of the two DHCP Servers and then should register their IP in DNS, but they don't.
We started to realize this issue 3 days ago, as some thinclients can register their IP in DNS. We assume that this problem started since the new 2008 DC.
Looking forward to your input. I enabled DNS debug loggin in the meantime.