It happens quite often, Erfgone. It only means either your program (the client) or the remote server has not received news from each other for too long. This is due to network congestion.
Or, if you happened to be logged when the server shut down, you could have got this message. Just check the status of the server on
this page. If the server is offline, wait for it to be online again and with the status \"running World: loaded\".
As I\'m writing this, the server is offline, which means everyone has to wait
In summary, you should just retry logging in.