The Battle.net desktop app is trying to connect to an invalid or nonexistent server.
What to do if you receive an error message when attempting to connect your Xbox account to your Battle.net account.
Troubleshooting steps to help you connect to the Battle.net desktop app.
What to do if you internet service provider (ISP) is encountering connection issues.
This error is usually caused by an unstable internet connection or a third-party program that is blocking access.
Failed to download a required update. Please check your internet connection and try again.
What to do if you think another person or group of people has targeted a DDoS attack on you
Troubleshooting steps for disconnection problems with the Battle.net mobile app