When I log in I get error code BLZ51901023
Typically this error is caused by Blizzard services being in maintenance, however in some cases it can be caused by connection issues.
- Reset your network devices to make sure your router hasn't become flooded with data.
If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
Release and renew your IP and flush your DNS to resolve any network conflicts.
Configure your security software's exception list to allow Blizzard applications to run.
Close all other applications to resolve software conflicts and free up resources.
Update your drivers to resolve any compatibility issues.