The most common reason is that another firewall or antivirus program is blocking Battle.Net. Other possible causes are DNS problems, broken cache files, or problems with Battle.Net’s servers in your area. Now that you know the main causes of the BLZBNTBGS8000001C error, here’s a simple guide to help you troubleshoot and hopefully fix the issue:
1. Check online for server problems
The first thing you should do before trying any fixes is check if Battle.net servers are having problems or ongoing maintenance. You can always check sites like Downdetector to see if other users have reported similar issues recently. You can also report problems yourself if you wish. For more details, you can check the Blizzard official Twitter page. Here, developers post updates about server maintenance or known issues. If you find out that the servers are indeed having issues, the only thing to do is wait for Blizzard to fix it—there’s nothing you can do except report your issue.
2. Clear the Battle.net cache
If the servers are working fine, the next thing to try is clearing the Battle.net cache, since corrupted cache files can cause this error. Many users have resolved this error by deleting the Battle.net cache files. You just need to delete the Blizzard Entertainment folder from the ProgramData folder, but first, make sure Battle.net is completely closed. Note: Before deleting anything, ensure that the Battle.net application isn’t running.
3. Change the DNS to Google
Before reinstalling anything, it’s worth checking your DNS settings. Sometimes, an unstable or incorrect DNS can cause connection issues with Battle.net. If this might be the case, you can try changing your DNS to Google’s public DNS. This often improves connection stability when accessing Blizzard’s servers.
4. Reinstall Battle.net
If none of the previous steps have worked and server issues have been ruled out, the last thing to try is reinstalling your local Battle.net application to deal with possible corrupted files. Many users have found that uninstalling and then reinstalling Battle.net solves the problem. It’s important to uninstall via the Control Panel, not just by deleting the installation folder.
