My minecraft server won't let me in. It just says: Connection lost. Does anyone else have this issue? If so

The server is offline. Are you an idiot or is your feeble mind having trouble understanding?

Are you sure the server is up?

Haven't used that service in a long time but when I did, they'd close servers all the time so you didn't have a big window when the server was up. Which is how they manage to keep the service free