Blizzard Battle.net errors and common problems

Can't connect: App cannot connect or stays offline

Means

The Battle.net app fails to sign in, stays offline or keeps returning to the login screen. When Blizzard services are up, Blizzard points to the network and security software.

First step

Check the BlizzardCS Twitter account for service problems. All steps

Update stuck: Install or patch stops at 0 B/s

Means

A game install or patch stops moving and the speed drops to 0 B/s. Blizzard says it is usually a connection problem or another program blocking the update.

First step

Check BlizzardCS for maintenance in your region. All steps

App won't open: Nothing happens when you start the app

Means

You start the Battle.net app and nothing opens, with no error message. Blizzard points to old drivers, security software and Windows permissions.

First step

Update your drivers. All steps

Waiting on another update: Update blocked by another install

Means

A game won't update because the app is waiting on another installation or update. Blizzard says patch servers being down are the usual cause, though local network trouble can also do it.

First step

Check BlizzardCS for maintenance in your region. All steps

BLZBNTBGS000003F8: Lost connection to Call of Duty servers

Means

Shows up in Call of Duty games on Battle.net when the game loses its connection to the Call of Duty servers. Blizzard treats it as a connection issue and sends further help to Activision.

First step

Check the BlizzardCS Twitter account for service problems. All steps

BLZBNTBGS80000011: Login fails during maintenance or on a bad connection

Means

The Battle.net app can't log you in. Blizzard says it usually appears while its services are in maintenance, and sometimes because of a connection problem.

First step

Check BlizzardCS and the game's status page, and wait if services are offline. All steps

BLZBNTAGT00000BB8: Update data could not be downloaded or saved

Means

The app failed to download or write new update data for a game. Blizzard lists security software, weak connections and damaged game files as causes.

First step

Add Blizzard apps to your security software's exception list. All steps

BLZ51901016: Login error in World of Warcraft

Means

Mostly seen when logging in to World of Warcraft. Blizzard says it comes from a PC below the game requirements or from a connection problem.

First step

Check that your PC meets the game's minimum requirements. All steps

BLZBNTBTS00000029: Patch server reached but no patch data

Means

The app reached Blizzard's patch server but couldn't download the patch information.

First step

Update your drivers and operating system. All steps