Exchange 2010 - Clustering & DAG problems after restoring CLUSTER from domain

Question

Hi there!
SITE 1
Primary EXCHANGE server (2010SP3 with latest CU) with all the roles installed
SITE 2
Secondary Exchange server (2010SP3 with latest CU) with only mailbox role for DAG purpouse.
SITE 1 and SITE 2 are connected with site-to-site-vpn.
Both servers are on 2008 r2 ENT.
About 3-4 months ago we have accidentely delete DAG node from domain. We have managed to restore it from domain with using AD RESTORE and checking that DAG is member of all the required Exchange groups in the domain.
Now we are having some big problems if site-to-site-vpn dropps, our primary Exchange server in SITE1 is not working.
If VPN dropps between the sites, OWA gets unavailable as it Exchange servers would think that Exchange in SITE2 is primary server.
Please advice us how to track and repair the root of the problem.
With best regards,
bostjanc

Answer 1

Running command:
Get-MailboxDatabaseCopyStatus –Server "exchangesrvname" | FL MailboxServer,*database*,Status,ContentIndexState
Gives as an output that all the databases are healthy:
Example of 1 database report:
MailboxServer      : ExchangeSRVname
DatabaseName       : DatabaseName1
ActiveDatabaseCopy : exchange2010
Status             : Mounted
ContentIndexState  : Healthy
Running command:
Test-ReplicationHealth –Server "exchange2010.halcom.local" | FL
Also gives output that everything is fine.
We still need to solve this issue so we will be unmarking the thread being ansered.
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : ClusterService
CheckDescription : Checks if the cluster service is healthy.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : ReplayService
CheckDescription : Checks if the Microsoft Exchange Replication service is running.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : ActiveManager
CheckDescription : Checks that Active Manager is running and has a valid role.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : TasksRpcListener
CheckDescription : Checks that the Tasks RPC Listener is running and is responding to remote requests.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : TcpListener
CheckDescription : Checks that the TCP Listener is running and is responding to requests.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : ServerLocatorService
CheckDescription : Checks that the Server Locator Service is running and is responding to requests.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : DagMembersUp
CheckDescription : Verifies that the members of a database availability group are up and running.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : ClusterNetwork
CheckDescription : Checks that the networks are healthy.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : QuorumGroup
CheckDescription : Checks that the quorum and witness for the database availability group is healthy.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
RunspaceId       : c8c20c41-7b3e-463c-9c98-56785d62c74b
Server           : ExchangeSRVname
Check            : FileShareQuorum
CheckDescription : Verifies that the path used for the file share witness can be reached.
Result           : Passed
Error            :
Identity         :
IsValid          : True
ObjectState      : New
bostjanc