I have to 2012 R2 server configured for DHCP Failover, and it was working fine. Lately they haven't been communicating with each other. If I set an IP address through the DHCP server only one sees it and the other just ignores it. This leads to some confusion between the servers. They are both Domain Controllers and DNS configured on both. How can I force them to communicate with each other. I tried doing the replicate failover scope option in the DHCP and it works for the secondary one but the primary one tells me that they are already in sync.
How do I get them to work together again?