If you are on Mac OS X El Capitan or an earlier version and are receiving a certificate error, it is likely your Keychain is corrupted. You can follow the steps below to try to have it fixed. If you are running the latest Mac (Catalina at this time), DO NOT reset your keychain; instead contact our support for help .
- Open Keychain Access, which is in the Utilities folder within the Applications folder.
- From the Keychain Access menu, choose Preferences.
- Click General, then click Reset My Default Keychain.
- Authenticate with your account login password.
- Quit Keychain Access.
- Restart your computer.
For a long term solution, you can update your Mac to the latest minimum operating system version, which is Mojave: https://support.apple.com/kb/SP777?locale=en_US. Older operating systems like El Capitan are no longer getting security and system updates from Apple.