Troubleshooting steps for connection problems
Out-of-date drivers and operating systems can cause a variety of issues, and are one of the first things to check when a game is having problems.
Troubleshooting steps for disconnections in StarCraft II
Follow these steps to troubleshoot problems with your low-speed or wireless internet connection.
What to do if your game doesn't launch after clicking Play.
Troubleshooting step for connection-related problems on Windows.
Troubleshooting for problems installing or patching the Starcraft II game client
Information on error BLZBNTBTS0000000B
How to remove your Blizzard Authenticator
Troubleshooting game or Blizzard services connection error BLZBNTAGT00000BB8