31
MSG-AUTH
Medium RiskTCP/UDP — Security & VPN
Port Overview
Port Number
31
Service Name
MSG-AUTH
Transport Protocol
TCP/UDP
Category
Security & VPN
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 31?
MSG Authentication. A legacy ARPANET protocol used for authentication within the MSG messaging system.
TCP/UDP
Security & VPN
Security Considerations
Port 31 (MSG-AUTH) 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.