Port 3102: SoftlinK Slave Monitor — The Classroom Watcher

What Port 3102 Is

Port 3102 is registered with IANA under the service name slslavemon — short for "SoftlinK Slave Monitor Port." It belongs to SoftLINK, a classroom management platform that lets instructors monitor, control, and broadcast to student computers across a lab or campus network. ¹

The "slave" is the student machine. The teacher's machine is the master. Port 3102 is how the master watches the slaves.

SoftLINK (developed by Applied Computer Systems) is used in schools and training centers for exactly what you'd expect: real-time desktop monitoring, screen broadcasting, locking out students from the Internet during exams, and remote log-off. The software needs a persistent connection to each student machine to do this, and slslavemon is one component of that infrastructure. ²

The Registered Port Range

Port 3102 sits in the registered port range (1024–49151). These ports are tracked by IANA, but registration is not strictly enforced — any application can technically bind to any port. The registry exists so software vendors can claim a port and reduce collisions, not to grant exclusive access.

In practice, this means:

• If you see traffic on port 3102, it's most likely SoftLINK activity on a school or corporate training network
• It could also be something else entirely — IANA registration is a courtesy, not a lock

What You'd Actually See

In a school computer lab running SoftLINK, port 3102 would show active connections between the teacher's machine and every student workstation. The traffic is internal to the local network — this port is not commonly exposed to the public Internet, and there's no reason it should be.

Outside of that context, seeing port 3102 open on a machine is unusual. It's not a commonly scanned port and has no known association with malware.

How to Check What's Using It

On Linux or macOS:

sudo ss -tlnp | grep 3102
# or
sudo lsof -i :3102

On Windows:

netstat -ano | findstr :3102

The process ID from either command maps to a running service — cross-reference it with your process list to confirm what's listening.

Related Ports

SoftLINK uses multiple ports for its various functions. If 3102 shows up in a network scan, look for neighboring ports in the 3100–3200 range — classroom management software tends to claim a block of ports for different aspects of its operation (file transfer, control, monitoring).