This error is usually caused by an unstable internet connection or a third-party program that is blocking access. Follow the steps below to resolve the issue.
If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
Close all other applications to resolve software conflicts and free up resources.
Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
Check your network configuration to find any issues with your firewall, router, or port settings.
Delete the Battle.net Tools folder to automatically rebuild outdated or corrupt files.
Run a security scan to remove any viruses or malware infections.
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