If you happen to be running a VMWare Server instance on a machine with multiple network cards, make sure that when you upgrade you reconfigure which network cards your VMs should use, otherwise you may find that despite the fact that the network interface in the VM is up you have no network access. It usually reports “No route to host” or “Destination Host Unreachable”. Sadly, VMWare doesn’t seem to be too bright about how it picks network interfaces and will sometimes pick one that isn’t connected to anything.

Oh well, it’s only the second time I’ve wasted hours to discover this. Hopefully the next time I run into this problem, this entry will turn up in Google and remind me of why.