Sorry I made a mistake. DMZ is a setting for modems/routers that use NAT security. Not for software firewalls.
So you'd have no control over the connection devices in your situation.

(Perhaps you might try the radical. A Fix for those whose ISP's block Limewire pages 1 - 3 which have links to alternative instructions. Which is using proxies which may or may not make the slightest of differences. But dedication at continually trying is the trick to proxies.)

The best listening ports in your situation are between 49152 - 65535. Such as 64049. But also try 80 or 443 or 427