How to Remove Expired Certificates - MacOS

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.

This is advanced troubleshooting. If you do not feel comfortable following these steps, please bring your device to the ITS Service Desk and we can assist you.

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, select Wi-Fi, click the Advanced... button, remove WiFi Setup and SecureMustangWireless. Click the OK button, 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 (Command-Space bar) 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. Next, search for “netadm” in the search box and click the Delete button to remove the certificates.

4. Restart computer.

Computer Restart

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

Connect to SecureMustangWireless

Get Help

ITS Service Desk
Monday-Friday 8 a.m. - 5 p.m.  
Location: Natatorium (No. 46), across from Spanos Stadium 
Phone: 805-756-7000
Email: servicedesk@calpoly.edu

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