Port 464

Kerberos is a widely used network authentication protocol that uses tickets to allow nodes to prove their identity securely. Port 464 is designated specifically for the Kerberos password change protocol, allowing users to update or reset their authentication credentials in a secure environment. It utilizes both TCP and UDP transport protocols to facilitate reliable communication and service discovery.

When a user requests a password change, their client communicates over port 464 to the Kerberos Password-changing server, which verifies the current authentication context and enforces any applicable password policies. This process is essential for maintaining security within domains using Kerberos, particularly in enterprise environments relying on Active Directory. The protocol employs encrypted channels during the exchange, typically layered over existing Kerberos security mechanisms, to ensure credentials are not transmitted in plaintext.

While closely related to port 88, which handles standard Kerberos ticket-granting operations, port 464 expressly serves functions tied to credential management. Proper configuration of services listening on this port is necessary to maintain robust identity management within secured network infrastructures.