Information on Cannot Stream Required Archive Data error.

What to do if you can't log in after patching WoW

These errors can be caused by temporary server issues in a specific region.

Troubleshooting steps for disconnections in StarCraft II

Troubleshooting steps for Diablo II (2000) crash errors

Information on error BLZ51900001

Information on error BLZ51901021

The game cannot log in due to corrupted cache data in the Users/Shared/Blizzard directory, or the directory's permissions are preventing the game from accessing the Users/Shared/Blizzard directory.

Troubleshooting steps for resolving network problems in World of Warcraft. 

「プレイ」をクリックしたのにゲームが起動しない場合の対処方法