Troubleshooting steps for latency problems in StarCraft II

What to do when you suffer input lag in-game

Troubleshooting performance problems in Modern Warfare II.

What to do if you experience high latency or frequent disconnects.

I have a question about a non-Blizzard game

What to do if you internet service provider (ISP) is encountering connection issues.

Player inquiring about the length of their non-ban penalty, or the date when it expires

For non-supported languages, the Blizzard Data file is available in English.

Player tries to log into wow from battle.net and gets disconnected right away

Security software which can be used to resolve virus and malware infections.