We are running a distributed AD domain across several sites, on Windows 2008R2, DFL and FFL are both 2012R2.
All of our DNS Zones are AD integrated and DNS servers are the Domain Controllers
We have recently added some 2012R2 virtual DCs to the environment.
Whenever a notebook is configured to use the 2012R2 servers, Logging on the domain is impossible. The "There are no logon servers available" message appears.
If we use locally cached credentials, then connectivity to the domain is restored, switching domain users on the notebook is successful even for non-cached accounts.
The issue only seems to affect notebooks, and not desktops.
Reverting to 2008R2 DNS servers restores domain connectivity.
Does anyone have any insight as to where the issue may lie?
We want upgrade all of our DCs to 2012R2 but this is obviously slowing us down.