Exchange 2010 DAG IP fails to be brought online

While running an Exchange 2010 Database Availability Group you might encounter an error in the System Log of your mailbox server stating that

Cluster IP address resource 'Cluster IP Address' cannot be brought online because the cluster network 'Cluster Network 2' is not configured to allow client access. Please use the Failover Cluster Manager snap-in to check the configured properties of the cluster network.

Open the Failover Cluster Manager go to Networks and select the faulty network reported in the above error. You will notice that "Allow clients to connect through this network" is enabled.

This seems to be a bug and the solution is pretty easy, you just need to deselect "Allow clients to connect through this network", click on Apply, select it again and apply once more the new configuration, this should take care of the error right away.

About Antoine Khater

I have been working in IT consultancy and solution integration since 1998 and I consider myself lucky to be, one in a few, making a living out of my passion. I am also member of the famous Experts Exchange (profile here) online community where I try my best to share what I have learned along the road.