I am currently helping a friend troubleshoot his internet connection. Right now he is experiencing almost no speed for his outgoing connection. He is able to download fine, and in programs such as aim people are able to send him files, however he is not able to send files, or make connections.
I have scanned his system for virus, spyware, and the like and after a pretty exhaustive search there really was nothing that would cause this problem.
We have tried to disable his firewall on the system, as well as enable the firewall and block off ports to see if, perhaps something nasty was clogging the connection but nothing.
He is currently using Comcast as his provider. He has talked to Comcast (and like most cable companies) they have assured him it is nothing on their end. Comcast has also come out to the house and checked all the outside connections.
At this point we have narrowed the problem down to the router.
Two computers are connected to the router. and both systems are experiencing the same issue (i cleaned the other system too btw) Talking with comcast the MTU setting has been set in the router to 1500. The problem is still there. I have my friend looking into a firmware upgrade for the router. They are currently using the WRT54G model. I will also note that this problem occured with an earlier router. This router was bought as a replacement and while it has helped with some general speed issues the upload it still a problem.
Both systems are running XP, however, neither of his systems is running service pack 2 (which could make this whole post invalid) I am urging him to upgrade but hes backing up his system a bit too slowly
At this point I am at a loss and the problem just seems to be getting more complicated, any insight would be wonderful.