What to do if you can't log in after patching WoW
Troubleshooting steps to help you connect to StarCraft II
Information about this error message and what it means.
What to do if you cannot log in after you changed your password
What to do if you cannot change the email or phone number that shows on the login screen because the field is greyed out
Troubleshooting steps to help you connect to Diablo III
How to resolve being unable to log in due to this error
What to do if you can't resync your authenticator.
Unable to install Battle.net Application after downloading from the website.