How to Remove Expired Certificates - Mac

Can't connect to wireless, but you were able to in the past? You may have expired certificates. Follow the below steps to get connected again.

1. Remove saved networks.

  • Go to System Preferences Network.
  • Select WiFi Setup, then click the Subtract button - at the bottom of the list to remove the network.
  • Next, select SecureMustangWireless, then click the Subtract button - at the bottom of the list to remove the network. Click the Apply button.
  • If you are unable to see the networks, click the Advanced button. Under the Wi-Fi tab, remove WiFi Setup and ​SecureMustangWireless. Click OK, then click the Apply button.

    Remove Saved Networks

2. Remove Cal Poly Device Enrollment profile.

  • Go to System Preferences, then click Profiles.
  • If present, select the Cal Poly Device Enrollment profile, then click the Subtract button - at the bottom of the list.

    Remove Cal Poly Device Enrollment Profile

     
  • If the Cal Poly Device Enrollment profile is not present, move to the next step.

3. Remove saved computer certificates.

  • Use Spotlight Search to search for "keychain access".
  • Once Keychain Access is open, make sure the lock at the top left of the box is unlocked. This will allow you to delete the necessary certificates.
  • Under Category > All Items, search for “thawte” in the search box and click the Delete button to remove the certificates.

    Remove saved computer certificates - thawte
  • Next, search for “clear” in the search box and click the Delete button to remove the certificates.

    Remove saved computer certificates - clear

4. Restart computer.

Computer Restart

5. Re-connect to wireless directly using SecureMustangWireless or WiFi Setup.

Connect to SecureMustangWireless

Get Help

If you are unable to connect to wireless after following these instructions, please call or visit the ITS Service Desk: 

Monday-Friday 8 a.m. - 5 p.m.  
Location: Room 100 of the Natatorium (No. 46), across from Spanos Stadium 
Phone: 805-756-7000

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