604
TUNNEL
Medium RiskTCP — Other
Port Overview
Port Number
604
Service Name
TUNNEL
Transport Protocol
TCP
Category
Other
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 604?
TUNNEL profile as defined in RFC 3620, a BEEP profile for creating tunneled connections through firewalls. Largely superseded by modern VPN and proxy tunneling solutions.
TCP
Other
Security Considerations
Port 604 (TUNNEL) 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.