Servers are W2K3 SP1 ISA 2004 Enterprise Edition 4.0.3439.50 Update: NLB seems to be working now after I made a couple of changes, however, I still cant ping the heartbeat nics on each box. It can ping itself, but not the other box (and vice versa). That seems odd to me. Do I need to configure the array communication firewall policy differently. It is allowing all outbound traffic betw array servers. Thanks.