I just bought the game on steam 3 - 4 hours ago, which I then played for. Great 
I logged out for a bit and when trying to log on from the client, I get an Unknow Error 504
and when from the browser I get an Error 0 
Please help
nm it fixed itself
Please let us know if it happens again.
If the game can’t connect to Steam’s services or Boundless’ services then the error reporting isn’t great at the moment.
will do, but so far no problems.
504 error is then the server are offline or if you can connect to it