How to Block HTTPS access to Gmail using SSL Control
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 block access to https://www.gmail.com using SSL Control from the LAN zone. Using this method would block all websites with the Common Name (CN) www.google.com.
Step 1. Login to the Sonicwall Management interface Step 2. Navigate to the Network> Zones page and click on edit on the LAN zone.
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.
Step 4. Navigate to the Firewall> SSL Control page. Step 5. Check the Enable SSL Control check-box. Step 6. Check the Enable Blacklist check-box. Step 7. Click on the Configure button to bring up the SSL Control Custom Lists window.
Step 8. Click on the Add button under Black List and enter the Common Name (CN) www.gmail.com. Step 9. Click on OK to save.
How to Test:
To test whether SSL Control is blocking https://www.gmail.com,
Step 1. Logout of the Sonicwall Management interface. Step 2. Open an internet browser. Step 3. Try to open https://www.gmail.com or https://mail.gmail.com Step 4. A "Connection Interrupted" message will be returned.
Under the Sonicwall > Log the following message will be shown.