Something happened to your server. It may have crashed. It may have been turned off. Or someone could have unplugged the internet. Whatever the case is, it's not good. Check out the server and see if there are other errors in the Parsec Application console that can explain the issue and visit the Common Errors page.
If it's related to the internet, you may have had a brief interruption in service and the internet was reconnected to a new local IP address or your ISP may have done something to limit the traffic coming from your IP Address.