Systat (protocol)
Systat or Active Users is a simple Internet protocol ostensibly useful for "debugging and measurement".[1] A connection to port 11, by either TCP or UDP, elicits a list of users currently logged into the system. Though it remains an official Internet protocol, its use is considered a security vulnerability.[2]
References
- ^
Postel, J. (1983). Active Users. IETF. doi:10.17487/RFC0866. RFC 866.
{{citation}}: Unknown parameter|month=ignored (help) - ^ "systat and netstat". eTutorials.