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How To block users from accessing HTTPS websites with expired certificate or Untrusted CA cert

03/26/2020 18 People found this article helpful 118,858 Views

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    Description

    SSL Control provides visibility into the handshake of Secure Socket Layer (SSL) sessions, and a method for configuring policies to control the establishment of SSL sessions. One of the main features of SSL control is to provide a way to specify which HTTPS certificates to block.
    This article describes how to Detect connections to HTTPS websites which have either expired certificates or their CA are untrsuted using
    SSL Control from the LAN zone.

    Resolution

    Step 1: Login to the Sonicwall Management interface
    Step 2: Navigate to the Network | Zones page and click on edit on the LAN zone
    Image
    Step 3: Check the SSL Control check-box to enable it in the LAN Zone. This will affect all LAN users since SSL Control is enabled for LAN zone
    Image
    Step 4. Navigate to the Firewall Settings| SSL Control page
    Step 5. Check the Enable SSL Control check-box.
    Step 6. Check the Detect Expired certificates check-box
    Step 7. Click the Detect Self-signed certificate check-box
    Step 8. Click the Detect Certificate signed by an untrusted CA
     Although only Certificate signed by an untrusted CA and Self Signed Certificate examples are presented SSLV2 and other option can also be used.

    Make sure "Block the connection and log the event" is selected

    NOTE: Specific Websites which the users know are good can be added under exclusion

    Image

    Step 9. Click on Accept to save

    How to Test:

    Step 1. Logout of the Sonicwall Management interface.
    Step 2. Open an internet browser.
    Try to access any SSL website which has either certificate signed by and Untrusted CA or has a Self signed certificate.
    Under the Sonicwall | Log the following message will be shown
    Image

    For Untrusted CA
    Image

    Related Articles

    • DNS Proxy: Creating DNS entries for internal/private network
    • Global VPN Client Connectivity Error
    • Unable to access certain websites, either slow or completely failing.

    Categories

    • Firewalls > TZ Series
    • Firewalls > SonicWall SuperMassive E10000 Series
    • Firewalls > SonicWall SuperMassive 9000 Series
    • Firewalls > SonicWall NSA Series

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