How to solve this problem on an incomplete Battle.net account
Troubleshooting steps for latency problems in StarCraft II
Troubleshooting steps for disconnections in StarCraft II
Troubleshooting step for connection-related problems on Windows.
Troubleshooting problems with the Battle.net friends list
Troubleshooting steps for communication and transmission errors.
What to do if you have trouble with the captcha
What to do if you receive an error that your code is already claimed in your account.
How to obtain error logs for Blizzard games
The Blizzard Update Agent could not install in the specified folder location.