Ah, hi there cluberti, I don't think I've talked with you since back when I was trying to put together my universal image. What you're saying makes sense to me, and I did check the _mcds tree, but I don't know what I'm doing unfortunately. I have two trees, the _msdcs one and a table1.com one. I'll post screenshots later, but in the table1.com tree, IIRC, there is an A record for both SRV-1 and SRV-2(The computer I'm running DCDiag from, that I'll be installing exchange on). Also, IIRC, the _msdcs tree is empty, which maybe explains why I'm getting that error? But if that's the case, why is it trying to utilize that tree when both SRV-1 and 2 are in the table1.com domain? I'll utilize the hyperlink you gave me and see what I can find. Thanks.