Hi all,
As strange that it may sound, I always had this problem (on W2003, 2008, 2008-R2, 2012, 2012-R2)...
I have 2 DCs wich are also DNS server with AD integrated zone(s). DNS clients use one as primary and the other as secondary. This configuration is mixed in the sense that some DNS clients use the DC1 as primary and DC2 DNS as secondary, others the opposite config DC2 then DC1.
My problem: if from the DNS clients perspective, the primary DNS is down (that sometimes happens), the client will NOT use the secondary. What ever config it might be (DNS1->DNS2 or DNS2->DNS1).
If I then check the second DNS server using NSlookup, it works ok.
I know (from theory) that is the primary DNS is not answering at all, the client will use the secondary DNS server if one is configured in the clients IP config. This newer worked.
Thank you for your help.
Thomas.