today i wanted to configure my Yahoo (im) YIM on my computer, but there was a firewall and i wanted to know which port Yahoo instant mesenger uses?

well, if you also want to know the port number that Yahoo instant messenger uses, ill give it to you.

TCP 5050

and

TCP 80

did this help you? if it did, please give me your comments.. thanks, i would like to know why you needed this information so i can help others.