I have a Treo600 with t-mobile connected via the t-zones gateway. I am using PDANet to connect my laptop to the device and use it as a modem. I can get Yahoo IM, and all Browser and Outlook email to work. But MSN and AOL don't work, and some other apps (trading platform) don't seem to be able to connect.

What are possible issues that could be preventing me? any suggestions are welcome..