Configuring the Web Filter as a Transparent Proxy
Navigate to Web Filter > Settings > Proxy Server > Transparent Proxy. Check the box next to Transparent proxy SSL to turn on Transparent proxy. Click Ok on the warning message. Click Save.
Note: Transparent proxy is only a feature of Web Filter 3.
Once Transparent proxy is enabled, you will have the option to add proxy hostnames. These hostnames will help you significantly lower the Transparent proxy load on your network. If you are only using Transparent proxy to decrypt SSL traffic, then you can simply add YouTube and Google domains to the Proxy Hostnames field.
After activating Transparent proxy, click the green plus icon to the right of Proxy Hostnames. The following will pop up. Add the hostname URL and an optional description and click Save.
You can delete a Proxy Hostname by clicking the gray “x” to the right of the hostname.