Port 3614: Satchwell Sigma — The Building's Nervous System

What Port 3614 Does

Port 3614 is officially assigned to Satchwell Sigma, a building and energy management system developed by Satchwell Control Systems and now maintained by Schneider Electric under its building automation portfolio.¹

The Sigma system manages building services from a central server: boilers, chillers, ventilation, fan coil units, lighting, metering, and more. Port 3614 is the channel through which the Sigma server talks to its clients — the operator workstations monitoring and controlling all of it.²

Both TCP and UDP are registered. In practice, TCP handles the reliable server-to-client communication that building operators depend on.

What Range This Port Belongs To

Port 3614 falls in the registered port range (1024-49151). These ports are assigned by IANA to specific applications and services upon request. They require no special operating system privileges to open, unlike the well-known ports below 1024.

A registered port assignment means: someone filed the paperwork, IANA recorded it, and the port is now officially associated with that service in the global registry. The IANA record for port 3614 names the contact as "Dave_Chapman" — a single person's name attached to a protocol that now manages the climate in commercial buildings across multiple continents.¹

About Satchwell Sigma

Satchwell Sigma is an IP-based building management platform. A Sigma installation typically involves:

• A central Sigma server that runs the management software
• Sigma clients — workstations where operators monitor and control the building
• Field controllers that interface with physical equipment (sensors, actuators, HVAC units)

Port 3614 handles the server-to-client layer. Field controllers communicate separately, typically over port 49152 UDP.²

The system is designed to manage an entire building's environment from one interface — which means port 3614 is, quietly, responsible for whether office workers are too hot or too cold.

Checking What's Listening on This Port

If you see traffic on port 3614 and want to know what's using it:

On Linux/macOS:

# Show which process is listening on port 3614
ss -tlnp | grep 3614

# Or with lsof
lsof -i :3614

On Windows:

# Show listening processes with port details
netstat -ano | findstr :3614

# Then look up the PID
tasklist | findstr <PID>

If port 3614 is open on a machine that has no building management software installed, investigate. An unexpected open port is worth understanding.

Firewall Considerations

Schneider Electric's documentation explicitly calls out port 3614 as one that must be allowed through firewalls for Sigma components to communicate.² If a Sigma deployment is misbehaving — clients can't connect, data isn't flowing — a blocked port 3614 is a reasonable first thing to check.