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If you are having trouble connecting to "DU Wireless", follow these steps:
1. Go to "System Preferences" and select “Network”
2. Select “Wi-Fi” then "Advanced"
3. Under Preferred Networks, remove “DU Wireless”
4. Next, search for "Keychain Access" (using the search tool) and select Certificates
5. Right-click and delete the “DC2012R2-2.dom.edu” certificate.
6. Next select “Passwords”
7. Right-click and delete “DU Wireless”
8. RESTART THE COMPUTER