How do I see what OUTBOUND ports are blocked?

Question

I'm trying to plan for getting a SlingBox but where I go to college they restrict the ports to stop file-sharing and spammers (it's a public/open network). I want to be able to watch TV between classes (say while I eat lunch) but I don't want to waste money on a slingbox if it won't work.

Is there any way I can check what outbound ports are open? I know 80, 110, and 443 are allowed and most others are blocked...but not exactley what's what.

My home ISP blocks ports 80, 25, and 110 to stop home-servers from working. I'm already using port 443 for remote TCP/IP printing, so I'd rather not give that up...I haven't had time to try many others because it involves changing my home network, then checking when I get to class, and the next day repeating the process - so I can check one port a day...not very practical.

Is there some program that will scan all the ports (or a lot of them) and tell me what OUTBOUND ports work so I can narrow my search for a port allowed both out of my college and into my home?

Answer 1

Try http://www.icannotconnect.com , for instance to test outbound port 80 you run the test

at http://port80.icannotconnect.com , you can replace 80 with any other port.