One of the servers has been having issues the past 1 hour or so, so about 1/3 of the game rooms have been affected. I have made a temporary set-up, so all the rooms are now back online. I am still waiting for a status update from my hosting provider about what happened to the server, and when it will be back online.
UPDATE: The server is now back online. I have reverted back to the normal set-up. I had to restart 2/3 of the game rooms though, but everything is now back to normal.