> > Are you running Bind9 on each DC ? > You should be, if the internal dns server is disabled. > Yes, I'm running Bind9 and the internal DNS server is disabled on each DC. > Possibly, but one thing at once :-) > Ok :-) > No, '47' is 2008R2, see here: > Oh, ok, sorry. So was it upgraded without fixing the DNS servers, wasn't it?