Blizzard servers could not be reached or may be offline. 

How to pay in a different currency in the Blizzard Shop

Troubleshooting for error "Too many attempts" when trying to log in to the Blizzard website

Cannot remember Blizzard password and want to reset it.

How to unlink your Twitch account from your Battle.net account

Information about Battle.net Balance use and restrictions.

Battle.net Balance cannot be used to pay for some Blizzard products

Steps on how to close down background applications and processes.

Information about why you may not be able to post in the forums, and steps for how to fix it.

How to disable compatibility mode.