How to troubleshoot and fix online problems

[traksta1]

First of all, thanks for response blackwiggle.

Did as recommended, sadly, no difference. Screen hangs at "connecting" after trying to enter an online race then after several minutes says words to the effect "server error, host has left game or too many players", then, "retry or return to main menu" rinse and repeat ad nauseum. This is a "new" problem that I cannot see is connected to any changes made at my end unless the Virgin Superdud, which is the only alteration to my system in recent months is not as efficient at finding addresses as the previous modem/router thingy. Not technically minded, its just a feeling I get that I'm making a call that the server is hard pushed to find a number for and then gives up, if you get my drift. There is no pattern to when it will connect to a game or the much more likely event that it won't. It all seems a bit fussy about who it connects me with now. Odd.