You can customize the domain whitelist categories by using the Network Security appliance Web UI:
The Network Security appliance supports a custom domain whitelist, a custom domain exception whitelist, and a predefined Trellix domain whitelist. These types of custom domain whitelists take precedence over the predefined domain whitelist categories in the third-party URL categorization database. The custom domain whitelist allows you to bypass domains that are considered to be nonmalicious. The Network Security appliance will not analyze a URL within a file or object for malicious content if it contains a whitelisted domain. A custom domain exception whitelist allows you to control which domains must be considered as malicious and never bypassed. The predefined Trellix domain whitelist allows the appliance not to decrypt HTTPS traffic that matches a domain in the predefined Trellix exclusion list.
Prerequisites
Administrator or Operator access to the Network Security appliance
(Optional) Download and install the latest URL categories from the third-party URL categorization database. For details about how to configure automatic URL category updates, see Configuring automatic URL category updates using the CLI. For details about how to force immediate URL category updates, see Forcing immediate URL category updates using the CLI.
A CONTENT_UPDATES license for security content updates