I had the same issue yesterday. Game stopped loading at 2% and after that I had the 'enable to connect to server' error message. I thought it was because my account had been banned or something, so I gave up after a few attempts. Today I was going to uninstall the game, but thought I would try once again to be sure and the game was working fine again, so not sure exactly what happened but if you can't connect or get the connection error message, just wait a few hours then try again.