Certificate Error on Apple computers in Safari and Outlook.


When accessing Outlook or some websites (including Single Sign On (SSO) Resources) from a MacOS, you may be prompted for a Certificate Error. 

This can happen for any website or server whose certificate is expired, for security reasons Apple can not automatically trust them. In Outlook or Safari you can "trust" the certificate and won't be prompted again. For non-University websites be sure it is a site you are certain about before trusting.

See image below:


  1. When prompted with a Certificate error. Click Show Certificate
  2. Click the checkbox for Always trust "*.fairfield.edu" (or the lowest line item with a red "X"). Then click Continue

  3. You will then be prompted for your computer password. Enter it, then click Update Settings.

  4. You will no longer receive the Certificate Error for that site.

For further assistance, please visit the ITS4U Help Desk located in NYS 215 or call 203-254-4069 during business hours.

Hours can be found here: ITS4U Help Desk Hours of Operation

Contact the ITS Help Desk in the Library Room 230 or at (203) 254-4069 for assistance.