Common Problems
This error is caused by a problem downloading or writing new update data. Try the following steps to resolve this error.
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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 you're using a wireless connection, optimize your internet connection to rule out a connection issue.
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Run the Blizzard Battle.net Desktop App in Administrator Mode to address many installation, patching, networking, and start-up errors.
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Run the repair tool to repair any damaged game files.
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Disable any proxies that may interfere with the login module.
Advanced Troubleshooting
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Try creating a new administrator account to resolve permissions issues.
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If you're using a VPN, try removing it.
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Run a security scan to remove any viruses or malware infections.
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Uninstalling and reinstalling the Blizzard App may resolve rare launcher issues.
Tried everything here?
If the steps above did not resolve your problem, visit our Technical Support forum or contact us.
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