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How can I block HTTPS websites in CFS4.0 - SonicOS 6.2.6 and above?

10/26/2021 1,247 People found this article helpful 112,440 Views

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    Description

    This article describes the method to block Google.com and Facebook.com using CFS 4.0.

    CFS examines the Server Extensions field in the Client Hello message and/or the CN in the Server Hello message to block HTTPS sites. HTTP sites are blocked by examining the Host field of the GET request. The following sections describe the methods involved in blocking both HTTP and HTTPS google.com and facebook.com.

    Resolution

    Enabling CFS and HTTPS Content Filter Globally

    • Login to the SonicWall management GUI.
    • Navigate to Manage |Security Services | Content Filter page.
    • Check the box Enable Content Filtering Service.
    • Click Accept .
    • Navigate to Manage |Policies |Objects |Content Filter Object Page.
    • Under CFS Profile Objects, select the  profile you wish to enable HTTPS content filtering for.
    • Under advanced tab, check the box Enable HTTPS Content Filtering.
    • Click OK
      Image


      Image

    Creating URI List Object

    • Navigate to Manage | Objects | Content Filter Objects page.
    • Click Add under URI List Objects, add CFS URI List Object window will display
    • Click Add to create google.com and facebook.com URI, click save.
    • Click OK .
      Image

    Creating CFS Profile Object

    • Navigate to the Firewall | Content Filter Objects page.
    • Click Add under CFS Profile Objects, Add CFS Profile Object window will display.
    • Configure follow the image below. 
    • Click Add and then Close.
      Image

    Creating CFS Policy

    • Navigate to Manage | Security Services | Content Filter page.
    • Click Add under CFS Policies, Add CFS Policy window will display.
    • Configure follow the image below.
    • Click OK .
      Image

      NOTE: Make sure the customized policy always has the higher priority than the CFS Default Policy so that it can be effective.Image

    Log Messages

    • When SonicWall CFS blocks HTTPS websites users will not see a blocked page.Image

    • While below default block page will be displayed on HTTP case.
      Image

    • However the following messages will appear in the logs.
    • Navigate to Investigate | Logs | Event Logs.
      Image

    Resolution for SonicOS 6.2 and Below

    The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.


    Enabling CFS and HTTPS Content Filter Globally

    • Login to the SonicWall management GUI.
    • Navigate to the Security Services | Content Filter page.
    • Check the box Enable Content Filtering Service.
    • Check the box Enable HTTPS Content Filtering.
    • Click Accept .
      Image

    Creating URI List Object

    • Navigate to the Firewall | Content Filter Objects page.
    • Click Add under URI List Objects, Add CFS URI List Object window will display.
    • Click Add to create google.com and facebook.com URI, click save.
    • Click OK .
      Image

    Creating CFS Profile Object

    • Navigate to the Firewall | Content Filter Objects page.
    • Click Add under CFS Profile Objects, Add CFS Profile Object window will display.
    • Configure follow the image below. 
    • Click Add and then Close.
      Image

    Creating CFS Policy

    • Navigate to the Security Services | Content Filter page.
    • Click Add under CFS Policies, Add CFS Policy window will display.
    • Configure follow the image below.
    • Click OK .
      Image
      NOTE: Make sure the customized policy always has the higher priority than the CFS Default Policy so that it can be effective.Image

    Log Messages

    • When SonicWall CFS blocks HTTPS websites users will not see a blocked page.
      Image

    • While below default block page will be displayed on HTTP case.
      Image

    • However the following messages will appear in the logs.
      Image

    Related Articles

    • App Control fails by schema error when editing VPN category
    • Custom Geo-IP list to exclude a website from Geo-IP filter
    • GVC stuck on acquiring IP for some users

    Categories

    • Firewalls > NSa Series > Content Filtering Service
    • Firewalls > NSv Series > Content Filtering Service
    • Firewalls > TZ Series > Content Filtering Service

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