is a feature that enables mapping of user IP addresses to usernames and group memberships, enabling user- or group-based policy and visibility into user activity on your network (for example, to be able to quickly track down a user who may be the victim of a threat). To perform this mapping, the firewall, the User-ID agent (either installed on a Windows-based system or the PAN-OS integrated agent running on the firewall), and/or the Terminal Services agent must be able to connect to directory services on your network to perform
. Additionally, if the agents are running on systems external to the firewall, they must be able to connect to the firewall to communicate the IP address to username mappings to the firewall. The following table lists the communication requirements for User-ID along with the port numbers required to establish connections.