Troubleshooting steps for communication and transmission errors.

What to do if you can't locate your StarCraft account.

Customer Support may ask you for your PayPal billing agreement ID or your order invoice ID when assisting you with a refund

Blizzard servers could not be reached or may be offline. 

Information on error BLZBNTBNA0000138A

How to play Blizzard games in offline mode

More information about authenticator security codes

Information on error BLZBNTTAS00000005

Information on error BLZBNTBGS0000A413

What to do when getting an error that the Battle.net Account has logged in somewhere else.