You support a Microsoft Lync Server 2013 Enterprise pool deployed in a high availability
configuration for Back End Servers named Backend1 and Backend2. You execute the GetCSDatabaseMirrorState cmdlet and discover the following errors. WARNING: Cannot connect to
database server “BackEnd2.contoso.com”.Message: A network-related or instance-specific error
occurred whileestablishing a connection to SQL Server. The server was not found or was
notaccessible. Verify that the instance name is correct and that SQL Server isconfigured to allow
remote connections. (provider: Named Pipes Provider, error: 40 – Could not open a connection to
SQL Server)DatabaseName
: rtcabStateOnPrimary
: PrincipalStateOnMirror
: StatusUnavailableMirroringStatusOnPrimary :synchronizedMirroringStatusOnMirror
:DatabaseName
: rtcxdsStateOnPrimary
: PrincipalStateOnMirror
: StatusUnavailableMirroringStatusOnPrimary :synchronizedMirroringStatusOnMirror
You need to resolve the connectivity issue and bring up the mirror databases to the synchronized
state between the Back End Servers. What should you do?

A.
From the Front End Server, create the inbound rule on the firewall.

B.
Run the Test-CsDatabase cmdlet.

C.
Run the Invoke-CsPoolFailOver cmdlet.

D.
From the mirror Back End Server, create the inbound rule on the firewall.