Failed to update the Battle.net Launcher. Please check your internet connection and try again.​

The Battle.net desktop app is trying to connect to an invalid or nonexistent server.

Information on Error BLZBNTAGT00001399

What to do if you receive an error message when attempting to connect your Xbox account to your Battle.net account.

You have attempted to connect to an invalid server. If this problem persists, please contact Customer Support.

Troubleshooting steps for disconnection problems with the Battle.net mobile app

What to do if you internet service provider (ISP) is encountering connection issues.

This article covers unexpected Blizzard Update Agent errors.

What to do when experiencing a disconnection from a Mythic+ run

Troubleshooting steps for linking a Twitch.tv account with a Battle.net account.