Ubisoft - I'm getting this error too. I purchased this game from Steam, had the "Error 1" none sense so had to re-install the game launcher and played for about an hour. Next time around, it crashed, then the intro played with the task bar still over the top of it! Restarted computer, got into game after letting intro run then I get this network error even though I can hit F2 and connect to the link in the game. Not worked since!
Seems that an internet connection was a pretty bad idea, and now I'm $50 out of pocket for a game which doesn't work.
I got this error too on PC, and I am not even play online game. I don't think this has anything to do with my router, I am play the mission, 20% of time, I can't start the missiong dut to this network error, other 80% I do can play, but time to time when I need load checkpoint the error shows says the network error and want me to wait restore and then it never did, in the mean time, my network have no issue what so ever, just 70% of time I load check point I got this error.
What you're describing makes it sound like you have some extremely bad packet loss or you're on a satellite connection (not recommended..) Any form of wireless connection can give you this type of behavior.