If you do get this error, try again!
I have found lately if I will just am persistent, it will link up.
Some times you can verify that the message is valid, as often you will see the hosted game drop from the list, or wink out temporarily (go and come back). Then try again!
I believe that chronic problems (people who can never connect) are almost always router related.
Additional interference can come from other programs running, other people on your router, network peak period congestion.
Keep working at it! Get that new router, read the Steam Support pages. It is all worth it!
BTW there were 20 thousand people playing this game in the last 24 hours, and almost 10 thousand of them are playing right now. Of course only a percentage of them are on multiplayer, but it gives you some perspective of the popularity (and internet demands) for this game. It is now number three on the Steam roster of over a hundred games.
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