I have some issues that worked fine before and suddenly stop working.
I have two domains (D1 and D2) in the different subnet so firewall configured properly because worked before.
D1 is windows 2008 R2 and D2 is windows 2003 upgraded fron NT. When I try to validate, I got this "Windows cannot find an active directory domain controller for the D2.domain.com." I think I have DNS issue so I have checked both DNS and looked fine.
What is an ideal DNS setttings? I can ping each other with IP but name. Somehow DNS is not working the way it should be.
I wish I could provide more information but ask me if you need more.
thanks in advance