Suddenly can't connect to AIM/iChat.

I'm sorry if this has been asked many times, and answered many times but I can't find an answer to my problem. Please help.
Recently I am not able to connect to iChat while I am at home. When I'm at school and using their wifi, iChat works fine. After awhile, it won't connect a box comes up and says, "Could not connect to AIM. The conncection to the host was unexpectedly lost." I can still go to websites and my .mac mail seems to be working fine, it's just the iChat that isn't working. I've checked for updates and it says I have all the updates that are available. To my knowledge, I didn't change any numbers, addresses, connections or whatever to cause iChat to stop working. I don't know what it could be, or what changed all of a sudden that it stopped working.
Thanks!

Hey,
I'm having the same problem, too. Only, for some reason, my iChat stopped working in my dorm room at school. It was working yesterday in my dorm room and worked when I was in class, however, it stopped connecting when I tried to sign on from the dorm. I tried changing my port from 5190 to 443 and nothing happened. It either says "connecting" for a very long time or it says "The connection to the host was unexpectedly lost." I'm not sure why there is such a sudden change, however, I really need to get on iChat. I also tried using Yahoo Messenger and the same thing happened also. Any more ideas besides attempting to change the port??
Thanks =)
shann131

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