I have 2 NBM 3.6 servers running Netware 5.1 SP3 that Id like to upgrade to version 3.9 SP1. The servers are working as reverse proxies only. They are running Netware 5.1 SP3 as virtual guests on a VMware ESX host.

What is the best way to upgrade these servers? Will I need to upgrade them to NW 6.5 SP7 first then do the NBM 3.9 upgrade? Any gotchas with a 3.6 to 3.9 upgrade?

Fortunately I can clone the VMs and do some test upgrades without affecting the production machines.