I have two DLINK DIR-100, and I checked them both on two computers and two different ISPs. The problem is, that they work properly only on port 80. I can view HTML without problems, and e.g. gmail chat works flawlessly. But if I try to use e.g. IM applications (like Skype, GTalk etc.) I don't get messages, and my messages are not sent for 50% of the time, or worse. I tried a small online gaming app that communicates with its server on port other than 80, and I tend to have considerable lags, and sometimes lose connection.
Have any of you encountered this problem? How to solve it?
I'll be grateful for every helpful response.