Port 3219: WMS Messenger — Enterprise server management, quietly registered

What This Port Does

Port 3219 is assigned to WMS Messenger (wms-messenger), a component of server management software made by WM Software Inc. The company builds tools for Citrix and Remote Desktop Services (RDS) environments: rolling restarts, CPU throttling, process monitoring, license management. WMS Messenger is the internal communication layer that ties those tools together.

The registration covers both TCP and UDP.

If you see port 3219 active on a machine, it's almost certainly a server running WM Software's management suite — likely in a healthcare, banking, or government environment, where the company's customer base is concentrated.¹

The Registration

IANA recorded this assignment on 2022-07-18, registered to WM Software Inc.²

WM Software has existed since 1994. The 2022 registration date means they operated for nearly three decades before formally claiming a port. This is common for smaller enterprise software vendors: they pick a port, ship the software, and register it later (if ever). The IANA registry isn't a prerequisite — it's a courtesy that prevents conflicts.

The Registered Port Range

Port 3219 sits in the registered ports range (1024–49151). This range works differently from the well-known ports (0–1023):

• No root required. Any process can open a registered port without elevated privileges.
• IANA assigns, but doesn't enforce. Registration is a public record, not a lock. Any software can use any port; registration just establishes who claimed it first and why.
• Conflicts happen anyway. Thousands of registered ports have multiple competing entries, unofficial uses, or assignments from software that no longer exists.

The registered range is less a controlled namespace and more a very large, partially organized filing cabinet.

How to Check What's Using Port 3219

If port 3219 shows up on your network and you're not running WM Software:

# Linux/macOS — show what process is listening
ss -tlnp | grep 3219
lsof -i :3219

# Windows — show listening processes
netstat -ano | findstr :3219
# then look up the PID:
tasklist | findstr <PID>

# Network-wide — scan a host
nmap -p 3219 <host>

An open port 3219 on a machine with no WM Software installed is worth investigating. No protocol runs here by default — something put it there.