OK, I'm not sure if anyone here can help me on this as I've stumped my technical support, product support people and experts in many other forums, but I'm desperate for an answer. I'm hoping someone here can help me! My hosting servers run off 2 x clustered IBM servers with ESX Enterprise Server (VMWare) that has 5 virtual servers installed. These virtual servers run Windows 2003. Each IBM server has 4 network cards connected back to my switch which in turn plugs into my router for internet connectivity. The problem is that I modified the IP address on one of the network cards in server 1 of the cluster, and lost access to that particular network card. For some reason, one of my virtual servers with a large site that I run was somehow affected. I have put the IP address back to what it was, replaced the network card etc ... still no go. Anyone have any ideas of what could be wrong? I don't want to have to rebuild this entire setup as it's been 5 months building & configuring it.