11
Systat
High RiskTCP/UDP — System & Infrastructure
Port Overview
Port Number
11
Service Name
Systat
Transport Protocol
TCP/UDP
Category
System & Infrastructure
Security Risk
High
Port Range
Well-Known (0-1023)
What is Port 11?
Active Users (Systat) service. Lists the currently active users on a system. Considered a security risk because it exposes user information.
TCP/UDP
System & Infrastructure
Security Considerations
Port 11 (Systat) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.