From Applications ->Utilities open Terminal
Copy and paste in these lines and press return after pasting each one in :
sudo killall -HUP mDNSResponder
sudo killall mDNSResponder
sudo dscacheutil -flushcache
You may need to put in your admin user password for each.
The auth module error is referring to downloading the module into /Users/Shared/Blizzard folder.
Sometimes this is due to corruption, and other times this is due to a network issue prior to the connection getting to us.
What happens when you create a new admin on your account and try to login the game with that one?
Threats of violence. We take these seriously and will alert the proper authorities.
Posts containing personal information about other players. This includes physical addresses, e-mail addresses, phone numbers, and inappropriate photos and/or videos.
Harassing or discriminatory language. This will not be tolerated.