I'm working with Active Directory in what was a single-server 2008 R2 environment. I've added a 2012 R2 DC, and everything was fine up to that point. Now I want to demote the old 2008 R2 DC. DCPromo failed because one of the FSMO roles couldn't be transferred to the new server. So I used ntdsutil to transfer the roles manually. All of the roles except the Schema Master transferred over with no problems, but when I try to transfer the Schema Master role it complains that it can't contact the existing server. If I do a "netdom query fsmo", it reports the correct name of the old server as the Schema Master.
I've checked DNS settings on both servers, and they're both pointing to themselves as DNS server. The old server does have 2 NICs, but the second one is disabled.
I'd really like to transfer the role "properly" rather than seizing the role. What else can I look at, please?