MFA-Duo - Duo Prompt Display Issues on iOS and Mac OS

Mac OS and iOS have content restrictions that may cause issues with the way the Duo Prompt renders.

Scenario 1

Users may be presented with a "403: Forbidden" error as shown in the screenshot below:

403 Forbidden error

RESOLUTION:

Have the user check and make sure that their time zone/clock settings are set automatically on their device.

iOS

  1. Navigate to Settings > General > Date & Time and make sure "Set Automatically" is toggled on.

Mac OS

  1. Navigate to the Apple Menu > System Settings > General (in the sidebar) > Date & Time and turn on "Set time and date automatically."

Scenario 2

Users may be presented with the error "This site can't be reached" and in some other cases may only see a blank screen.

Note: This information can be found at https://help.duo.com/s/article/3710?language=en_US

RESOLUTION:

  • Make sure that JavaScript is enabled in Safari on your macOS or iOS device. 
  • Disable content restrictions on the device. The instructions are described below for different versions of iOS or macOS.

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.

    Note: If you do not want to fully disable restrictions, you can add duosecurity.com at the bottom of the "Allowed Websites Only" list.

iOS 11 or Older

  1. Go to Settings > General > Restrictions > Websites.

  2. Uncheck Limit Adult Content to disable all content restrictions.

Mac OS 10.15 (Catalina) or Newer

  1. Open System Preferences.

  2. Navigate to Screen Time > Preferences > Content & Privacy.

  3. Set any Web Content restrictions to Unrestricted Access.

    Note: If you do not want to fully disable content restrictions, you can add duosecurity.com in the "Customize" section of the "Allowed Websites Only" option.