I played a bit more TrackMania United tonight, finishing off a bunch of levels imported from the older TM:Sunrise game. I went online for a bit and found a US server with seven people on it, but it soon dropped down to only four, and they were kicking my ass anyway, so I called it off there.
I also tried to get the dedicated servers of GTR2 and GT Legends working, but I’m not sure what’s wrong. The server runs, the client can see it in the browser, but I can’t connect to it when it’s on the same machine. I’ll have to try installing it on the MBP to see if it at least works from a different one.