Duo Prompt display issues on iOS and macOS


Problem


When attempting to login to a Duo-protected application on iOS or macOS, the Duo prompt doesn't show, and instead the following error message appears:

You cannot browse this page at "duo.com" because it is restricted 

You may see a gray box appear instead of the Duo prompt in some cases. 

Screenshot: Duo grey screen error

Cause

Solution


For iOS 12 or newer:

  1. Navigate to Settings > Screen Time > Content & Privacy Restrictions > Content Restrictions > Web Content
  2. Uncheck Limit Adult Websites to completely disable content restrictions.
    • If you do not want to fully disable content restrictions, you can allow duosecurity.com within the Content Restrictions page
      on the iOS device.

      Image shows the Web content section of iOS settings. "Limit Adult Websites" is not checked, and "Unrestricted Access" is checked.

    • If you are opening Screen Time for the first time, you will be prompted to set up the phone for either yourself or a child, and have the option to set a passcode.

For iOS 11 or older:

  1. Go to Settings > General > Restrictions > WebsitesUncheck Limit Adult Content to completely disable content restrictions.
  2. Uncheck Limit Adult Content to completely disable content restrictions.

Image shows the "Websites" section of iOS settings. Uncheck "Limit Adult Content."

For macOS 10.15 (Catalina) or higher:

  1. Open System Preferences
  2. Navigate to Screen time > Preferences > Content and Privacy
  3. Set any Web Content restrictions to Unrestricted access
    • If you do not want to fully disable content restrictions, you can allow duosecurity.com within the Allowed Websites Only list on macOS.

If you still have questions or need additional assistance, please submit a ticket or call the ITS Service Desk at (858) 246-4357