Symptoms
You receive the following message on your Mac, and it will not connect to the TTUnet wireless network:
Authentication failed on network "TTUnet"
Cause
Unknown
Resolution
1) Click Disconnect.
2) Rename your com.apple.network.eapolclient.configuration.plist file and restart your Mac.
3) Set up your connection to TTUnet again.
OUTCOME
Your Mac will successfully connect to the TTUnet Wi-Fi network.