BLZBNTBTS0000004A

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.

1. If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
2. Try closing background applications to resolve any software conflicts.
3. Configure your security software's exception list to allow Blizzard applications to run.
4. Check your network configuration to find any issues with your firewall, router, or port settings.
5. Delete the Battle.net Tools folder to automatically rebuild outdated or corrupt files.
6. Run a security scan to remove any viruses or malware infections.