Where is the setting to keep a Cluster from failing over if the Passive node experiences a network issue. Here is what happened. I have a two node CCR Cluster. Windows is 2008 SP2 and Exchange is 2007 SP1, update rollup 9. Node 1 is the Active node and Node 2 is the Passive node. We are running on ESX 4.0 and all the servers are virtual. I decided to update the NIC drivers on the Passive node only. I figured because it was the Passive node, I could without an issue. Well, the drivers installed just fine but caused a brief network connectivity problem on Node 2 which was to be expected. This caused Node 1 to fail over all its resources to Node 2. We are up and running on Node 2 now without a problem but if I try to update the NIC drivers on Node 1, I am sure the same thing will happen. I have been poking around in the settings but wasn't sure what to do. I did not know if there was any special process to follow to keep this from happening or is there is some check box that would prevent this.