Unexpected Blizzard Update Agent errors.

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

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

Information on Error BLZBNTAGT00001399

We're having trouble starting the Battle.net desktop app. Please try again. If the problem persists, try restarting your computer.

Troubleshooting the error message "The code you entered cannot be claimed."

Information on error BLZBNTBNA000007D0

This error occurs when you have connected to our patch server but you cannot download patch information.

Information on error BLZBNTBNA000003E8

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