trillian file sending with router

Hello! I'm using trillian 3 basic on a notebook with a wireless internet connection. My router is the TP-LINK TL-WR542G. I have trouble sending files over icq and irc dcc, receiving files just works fine and sending files over msn does work too. I've already figured out that I have to configure ports for trillian and I've already done so, but it still doesn't work. I'd be happy if someone had some advice for me! thanks