We have a 2008 NLB cluster of 2 machines we shall call A and B and a 2008 file server called C
They are all on VMware as virtual machines. The cluster servers are sharepoint servers and access data from fileserver C.
The problem we had was that cluster server B could not see fileserver C and vice versa either to ping or tracert or to access shares via IP or host name.
but could they could both see all other servers on the network,
After trying lots of things we tried performing a drain stop on server A from NLB manager. Suddenly Cluster server B could see the file server and vice versa. We brought back cluster server A and still everything worked fine.
Thing is that while it works for now we need to know why this happened before we can make these servers live in a production environment but are at a loss to explain.