What to do if you can't log in after patching WoW
Unable to connect to Battle.net
More information about the "Login via Battle.net failed!" error
Account information fields are missing when logging in to StarCraft II on Mac machines.
Troubleshooting steps to help you connect to Overwatch
Troubleshooting steps to help you connect to Diablo III
You can't post on our forums if you're on a Starter Edition account.
The game cannot log in due to corrupted cache data in the Users/Shared/Blizzard directory, or the directory's permissions are preventing the game from accessing the Users/Shared/Blizzard directory.
Your account is unable to log into Blizzard services.