I can't enter the game.

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yes of course sometimes having such issues, you have to restart steam (if you logged from Steam) or restart your launcher client (if you logged from launcher itself), its usual problem because maybe your speed internet having delay bandwith or the servers is having problem too, or alternate way try to sign out your PC then sign in again it will refresh all of its inside including internet, might be this will help you there..

Every time I do, I get an error and then a message saying "You have been disconnected from the server", and then it crashes after I press "Accept". The version I'm playing is Riders Of Icarus: SEA.