Port Requirements

Tenable Nessus port requirements include Tenable Nessus Manager, Tenable Nessus Professional, Tenable Nessus Expert, Tenable Nessus Essentials, Tenable Nessus scanners, and Tenable Nessus cluster node-specific requirements and Tenable Nessus Agent-specific requirements.

Tenable Nessus Manager, Tenable Nessus Professional, Tenable Nessus Expert, Tenable Nessus Essentials, Tenable Nessus Scanners, and Tenable Nessus Cluster Nodes

Your Tenable Nessus instances require access to specific ports for inbound and outbound traffic.

Inbound Traffic

You must allow inbound traffic to the following ports.

Port	Traffic
TCP 8834	Accessing the Tenable Nessus interface. Communicating with Tenable Security Center. Interacting with the API.

Outbound Traffic

You must allow outbound traffic to the following ports.

Port	Traffic
TCP 25	Sending SMTP email notifications.
TCP 443	Communicating with Tenable Vulnerability Management. Communicating with the plugins.nessus.org server for plugin updates.
UDP 53	Performing DNS resolution.

Tenable Nessus Agents

Your Tenable Nessus Agents require access to specific ports for outbound traffic.

Outbound Traffic

You must allow outbound traffic to the following ports.

Port	Traffic
TCP 443	Communicating with Tenable Vulnerability Management.
TCP 8834	Communicating with Tenable Nessus Manager. Note: The default Tenable Nessus Manager port is TCP 8834. However, this port is configurable and may be different for your organization.
UDP 53	Performing DNS resolution.