The game is telling you it cannot get to the Internet. Or, you are running an older version of the game, which cannot find the game manager as it was recently moved a couple of patches ago. In which case, the game truly cannot find the game manager.
If you are behind a router, your router could be the problem. Power cycle it. If the firewall is enabled in the router and your ISP is in control of that router, then contact your ISP as they could have easily made changes, without your knowledge.