Common Problems
This error occurs when the Blizzard Agent can't start due to missing or corrupted data. The Blizzard Agent is the program that launches, updates, and installs your Blizzard games.
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Delete the Battle.net Tools folder to automatically rebuild outdated or corrupt files.
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Make sure Windows Secondary Logon is enabled, which Blizzard Agent requires to run correctly.
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Try closing background applications to resolve any software conflicts.
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Disable or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
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If the problem persists, uninstall and reinstall the game.
Tried everything here?
If you have tried these steps and still require assistance, visit our Technical Support Forums (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) (Heroes of the Storm) (Overwatch) or contact us.
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