To deploy the Cisco Security for Chromebook to enable DoH protection, the following prerequisites must be met:

  • You must have Umbrella login credentials.
  • To push the Cisco Security for Chromebook client to all the Chromebook devices, you need a Google Workspace Admin account.
  • Cisco recommends that you sync Google Workspace Identities with Umbrella to apply Google Workspace user and organizational unit based policies. For information about integrating the Google Workspace Identity Service, see Integrate Google Workspace Identity Service.
  • Chrome OS 110 or later is required to enable DoH-based DNS layer protection on Chromebooks.
  • Chromebooks must not be in Kiosk mode.
  • For DNS layer protection, Port 53 UDP and 443 TCP must be allowed.
  •, and must be accessible.
  • Chromebooks must be connected and logged in.
  • Install Cisco Umbrella root certificate on your Chromebooks to avoid certificate errors when accessing an Umbrella block page. For more information, see Install the Cisco Umbrella Root Certificate.
    For more information about how to push the Umbrella root certificate from Google admin console to all your Chromebook devices, see Set up TLS (or SSL) inspection on Chrome devices.
  • In the Google Workspace Admin console, you must disallow the incognito window. From the Incognito mode menu, choose Disallow incognito mode. For more information, search for Incognito Mode in Chrome Enterprise and Education Help.
  • The following devices and operating systems are not supported:
    • Chrome browser on OS X, Windows, and Linux.
    • Devices running variations or third-party distributions of ChromeOS, such as Neverware CloudReady.
  • Network requirements
Port and
Source / DestinationNotes
53 (UDP)Configured DNS
Resolvers should be
443 (TCP)Registration.
HTTPS. Used for
registration of the client.
443 (TCP)sync.hydra.opendns.comHTTPS. Used to sync device
details and to fetch
443 (TCP)doh.umbrella.comHTTPS. Used to resolve DNS requests.

Migration Scenarios > Prerequisites > Limitations