What to do if you internet service provider (ISP) is encountering connection issues.
Troubleshooting steps to resolve performance problems in Diablo III.
Troubleshooting steps for communication and transmission errors.
How to submit feedback or report an issue with the matchmaking system
Information on error message BLZBNTBGS8000001C.
Troubleshooting for Battle.net desktop app crashes.
Reporting your own behavior won't prevent action.
How to report a player who is threatening with harming another person or a place