How to Delete an Untrusted Certificate in a Mac

You can manually manage certificates on a Mac computer.

When you use an Apple computer to connect to certain wireless networks or other authentication services, the Mac OS X operating system will prompt you to accept a security certificate and enter your username and password. During this process, the system will also inform you if the certificate is trusted or untrusted. If you have previously accepted an untrusted certificate but no longer want it to be stored on your Mac, you can use the Keychain Access tool to delete it.

Things You'll Need

• Mac running OS X 10.5 or later

Instructions

1. Open a new Finder window by clicking on the "Finder" icon in the Dock.

2. Open the "Go" menu at the top of the screen and choose "Utilities."

3. Double-click on the "Keychain Access" icon.

4. Highlight "login" from the "Keychains" section on the left side of the window.

5. Select the certificate you want to delete from the list in the main section of the window. When you select an untrusted certificate, a red X symbol will appear underneath the certificate's name.

6. Go to the "Edit" menu at the top of the screen and choose the "Delete" command.

7. Hit "Delete" in the dialog box to confirm your decision to remove the selected untrusted certificate.

References

• Virginia Tech: Deleting VT-Wireless Certificates in Mac OS X