65
TACACS-DS
Medium RiskTCP/UDP — Security & VPN
Port Overview
Port Number
65
Service Name
TACACS-DS
Transport Protocol
TCP/UDP
Category
Security & VPN
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 65?
TACACS-DS (Terminal Access Controller Access Control System - Database Service) is a predecessor variant of TACACS used for centralized authentication of terminal access. It was used in early ARPANET environments to control access to network devices. It has been fully superseded by TACACS+ (port 49) and RADIUS.
TCP/UDP
Security & VPN
Security Considerations
Port 65 (TACACS-DS) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.