Can you connect to secondary alright?
Did you forward ports for winmx. Go to
www.portforward.com and see your outer model there. Forward ports for winmx as given there.
Does the channel list load?
Check if the windows firewall if off. Also i'd recommend that you get a firewall to protect your pc. As firewalls are important for safety of the computer. Sygate is 100% free and works great with winmx.
You might want to consider sygate once this problem is solved.
Cheers