Well, I don’t fully understand your question there, but I think this is what you mean. Heres a quote from the Yahoo Messenger website:
Quote:
quote:If Messenger is unable to find an open port, ask your System Administrator to open port 5050 to our Messenger servers, cs1.yahoo.com, cs2.yahoo.com, and cs3.yahoo.com.
So, I think the answer to your question would be port 5050?