After installing Excange CU18, two database passive copy is disconnected and failed state

Question

The Microsoft Exchange Replication service was unable to perform an incremental reseed of database copy 'MBXDB02\OCAGBD-AB-EX1' due to a network error.
The database copy status will be set to Disconnected. Error Microsoft.Exchange.Cluster.Replay.NetworkCommunicationException:
An error occurred while communicating with server 'OCAGBD-AB-EX2'. Error: A connection attempt failed because the connected party did not properly respond
after a period of time, or established connection failed because connected host has failed to respond 10.10.10.11:64327 ---> System.Net.Sockets.SocketException:
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host
has failed to respond 10.10.10.11:64327 at System.Net.Sockets.Socket.InternalEndConnect(IAsyncResult asyncResult) at System.Net.Sockets.Socket.EndConnect
(IAsyncResult asyncResult) at Microsoft.Exchange.Cluster.Replay.TcpClientChannel.TryOpenChannel(NetworkPath netPath, Int32 timeoutInMs, TcpClientChannel& channel,
NetworkTransportException& networkEx) --- End of inner exception stack trace --- at Microsoft.Exchange.Cluster.Replay.NetworkManager.OpenConnection
(NetworkPath& actualPath, Int32 timeoutInMsec, Boolean ignoreNodeDown) at Microsoft.Exchange.Cluster.Replay.LogCopyClient.OpenChannel(Boolean useScavenge)
at Microsoft.Exchange.Cluster.Replay.LogCopyClient.QueryEndOfLog() at Microsoft.Exchange.Cluster.Replay.FailoverPerformanceTrackerBase`1.RunTimedOperation
(TOpCode opCode, Action operation) at Microsoft.Exchange.Cluster.Replay.IncrementalReseeder.IsIncrementalReseedRequired
(Action checkAbortRequested, Int64& highestLogGenCompared, Boolean& e00IsEndOfLogStream)

Second Error:

The log copier was unable to communicate with server 'OCAGBD-AB-EX1.example.com'. The copy of database 'MBXDB01\OCAGBD-AB-EX2' is in a disconnected state.
The communication error was: An error occurred while communicating with server 'OCAGBD-AB-EX1'. Error: A connection attempt failed because the connected party
did not properly respond after a period of time, or established connection failed because connected host has failed to respond 10.10.10.10:64327
The copier will automatically retry after a short delay.

Answer 1

Hi @Al Amran ,

Are these two servers in different sites?
Because from these logs, I think you can first check the Network settings of your DAG.

Get-DatabaseAvailabilityGroupNetwork | FL  

If that's all OK, then you can check the copy status:

Get-MailboxDatabaseCopyStatus *  

And try reseeding the copies again.

Also you can try the methods of these threads: http://exadminmcse.blogspot.com/2012/05/troubleshooting-exchange-2010-dags.html
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

Regards,
Lou

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