We have 3 Active Directory Controllers. Two our on one side of our network (A+B) and one is on the other side of a VPN connection (C). When the VPN connection goes down A and B lose all information until they can reconnect with C. This is a recent development since we replaced a new PIDC (A). A query shows that A has all the roles but a dcdiag /test:advertising on A shows:
Starting test: AdvertisingWarning: DsGetDcName returned information for
\\C.domain, when we were trying to reach A.
SERVER IS NOT RESPONDING or IS NOT CONSIDERED SUITABLE.
......................... A failed test Advertising
When I run the same test on B I get the same error replacing A with B.
Has anyone seen this before? My network is in a fragile state and I desperately need answers.