We’ve recently had some issues with our PDC (which is also the Preferred DNS server for all computers on our network). When the PDC is down, no one is able to resolve domain names. All computers on the network have an Alternative DNS server set to another DC, however, the DNS clients don’t seem to utilize this alternate DNS server. Any ideas? This causes major issues (as you can imagine) since if this one machine is down, there is no DNS which means no AD.