Port 3017 — Miralix IVR and Voicemail

What This Port Is

Port 3017 lives in the registered port range (1024–49151). These ports are assigned by IANA on request — a vendor or project stakes a claim, files a name, and the assignment goes into the registry. Unlike the well-known ports below 1024, registered ports don't require root privileges to open, and their assignments carry less weight. Many are claimed by software that's long since disappeared.

IANA lists port 3017 under the name "event listener" — a description so generic it fits almost any server socket ever written. The name signals that whoever filed it wasn't thinking about clarity.

Who Uses It

The most documented claim on port 3017 belongs to Miralix, a Danish contact center software company. Their IVR (Interactive Voice Response) and voicemail system uses TCP port 3017 for communication between clients and the Miralix server — exchanging call signals, voicemail data, and control commands for automated voice workflows.

If you're running Miralix contact center software, port 3017 being open is expected. If you're not, it shouldn't be.

Security Notes

Older port databases flag this port as having been used by malware in the past. That's worth knowing, but it's also true of hundreds of registered ports — attackers use whatever's convenient. The presence of traffic on port 3017 doesn't mean malware; the absence of Miralix software alongside that traffic does.

How to Check What's Listening

On Linux or macOS:

ss -tlnp | grep 3017
# or
lsof -i :3017

On Windows:

netstat -ano | findstr :3017

These commands show you the process ID behind anything listening. If you don't recognize it, that's worth investigating.

Why Unassigned and Lightly-Used Ports Matter

The registered range contains over 48,000 ports. Most are empty. Some have stale claims. A few are actively used by software you've never heard of.

That distribution is actually useful. When your firewall policy is "deny all, allow by exception," lightly used ports are the easy wins — there's rarely a good reason for port 3017 to be reachable from the public Internet unless you're running Miralix software and intentionally exposing it.