What to do if you can't open the Battle.net desktop app, and there are no error messages when you try.
Troubleshooting for error Code: BLZBNTBGS0000020A
Troubleshooting steps for this error in Diablo III
Your login session has expired. Please log in again.
Troubleshooting steps when you can log into your account management page but not the Battle.net App
Blizzard Customer Support cannot lock your account on request
Troubleshooting steps to help you connect to the Battle.net desktop app.