This is just an FYI for everyone. We have discovered the OVA for the NetSUS appliance is incompatible with ESXi 5.1 Update 1. The problem is the Ubuntu 14.04.1 LTS that the OVA is based on. The guest is constantly losing network connectivity and is unusable as a result. ESXi 5.1 update 2 or newer will work.
Roger Herling
UL LLC