Troubleshooting error BLZBNTBNA000000CA

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

Troubleshooting steps for issues installing the PTR client

Information about an issue with achievement progress resetting after the 10.1.5 patch.

Troubleshooting step for connection-related problems on Windows.

Information for issues where a green, yellow, or red circle will show up in game despite the game being fully downloaded.

Troubleshooting your security programs can resolve issues preventing you from installing or using Blizzard software.

Battle.net desktop app information

Information about the keyboard setting automatically changing to US by default since patch 9.2.

Information on moving Blizzard games to a different hard drive