Internet-Security.com TCP port 79 details

TCP port 79 is used by the Finger protocol (RFC 1288).
Common servers include fingerd/in.fingerd on UNIX/BSD systems (e.g., FreeBSD/NetBSD/OpenBSD base systems and Solaris) and GNU inetutils fingerd packaged on Linux distributions such as Debian and Ubuntu.
The standard finger client (finger command) ships with many UNIX-like OSes; third-party Windows tools like AnalogX Finger also use TCP/79.
Some community and hobbyist hosts still run public finger services (for example, several “tildeverse” servers like tilde.team or tilde.club expose finger on 79).
Cisco IOS historically provides a Finger service via the “service finger” feature, listening on TCP/79 when enabled.
HP TCP/IP Services for OpenVMS includes a Finger server that listens on port 79.
The port is associated with hacking/exploitation: the 1988 Morris worm famously exploited a buffer overflow in BSD fingerd, and finger services can leak user/account details, so they are often blocked or disabled today.

TCP 79