Same problem here. It said incorrect username or password, so i clicked the forgot password? link and created a new password; i logged into my account on the ubisoft website and it works but not for the game. And the uplay website wont open either!!! WTH Ubisoft... Please attempt to keep us updated.
Hello everyone... sorry to hear about your Login problem/issue... I'm not sure why some are having this problem/issue and not others. I have been online playing Splinter Cell Conviction today and have not had any problems/issues at all (nor have I ever had any Login problems/issues). I am guessing it's due to the DRM (digital rights management); DRM is like a digital lock that prevents "intellectual property" from being copied freely, just as physical locks are needed to prevent personal property from being stolen (DRM is very controversial). It's possible that if you have more than one Ubisoft Game installed, there may be a conflict (malfunction/bug) between the different DRM's in the games, which could possibly keep you from logging in (a huge stretch). It's also quite possible (and more likely the case) that if you have any Ubisoft "cracked" or "pirated" games installed, that this could be directly related to the login problem/issue. Let me explain; the DRM digital lock is inherently intended to block all illegal use of the game and Ubisoft "cracked" or "pirated" games bypass this DRM... well, now when you try to run you're installed "legitimate" Ubisoft games, it won't let you login because your "illegitimate" Ubisoft games have altered your "legitimate" Ubisoft configurations (with respect to the DRM)... hence you can't login. If this is the case, my only suggestion would be to uninstall all of your legitimate and illegitimate Ubisoft games and do a clean install of only your legitimate Ubisoft games. Good luck.