WoW2GO will intercept and tunnel all traffic which goes through
following ports: 3724,6112,6881-6999 + what ever you entered in "Vent
Port". It is my understanding, that you only have to have 3724 port
to be able to play. I assume your private server using different
port. What you can try to do is to enter this port in "Vent Port"
preference and see if it will help.
Andrei Tchijov
Leaping Bytes, LLC