2 CAS servers in an array, 2008 R2 - same SPs/patch level. 2 Datacentre DAG (prod and DR)... NICs on the CAS servers are configured exactly the same way, binding order is identical, A/V is the same on both with the same exception, no IPv6 entries in DNS for either, routes are the same, etc.
CAS Server 1 is showing all Database Copies as Healthy/Mounted
CAS Server 2 is showing prod DB Copies as Healthy/Mounted but the DR copies as "Service Down". CAS Server 1 and 2 are in the same DC as prod db copies. PFs on DR server are shown as unavailable as well. Looking under Properties of the DR DB the following error is displayed "A server-side administrative operation has failed. The Microsoft Exchange Replication service may not be running on server DRServer.domain.com. Specific RPC error message: Error 0x71a (The remote procedure call was cancelled) from cli_GetCopyStatusEx2"
All DBs are mounted on DR DAG, all services are working and tested. Ideas?