The new docs.trellix.com features a modernized UI and AI-powered conversational search. Content is currently available in English, with additional languages launching in mid-October 2026. We hope you enjoy the updated experience.

Block DNS traffic on a client system

Prev Next

To refine firewall protection, you can create a list of FQDNs to block. Firewall blocks connections to the IP addresses resolving to the domain names.

Before you begin

Make sure that the interface mode for the Trellix Endpoint Security (ENS) Client is set to Full access or log on to the Trellix Endpoint Security (ENS) Client as administrator.



Task
  1. Open the Trellix Endpoint Security (ENS) Client.

  2. Click Firewall on the main Status page.

    Or, from the Action menu GUID-A3B12F55-7EE9-4519-8FCA-9ACA85C3661F-low.png, select Settings, then click Firewall on the Settings page.

  3. Under DNS Blocking, click Add.

  4. Enter the FQDN of the domains to block, then click Save.

    You can use the * and ? wildcards. For example, *domain.com.

    Duplicate entries are removed automatically.

  5. Click Apply.