Port 2014: Registered, Mostly Forgotten

What Port 2014 Is

Port 2014 sits in the registered ports range (1024–49151). These are ports that individuals, companies, and standards bodies can formally request from IANA — the Internet Assigned Numbers Authority — for a specific service. Unlike the well-known ports (0–1023), you don't need operating system privileges to bind to them. Unlike the ephemeral ports (49152–65535), they're intended for long-running services, not temporary client connections.

IANA has two entries for port 2014:

• TCP: troff — A Unix text formatting utility from the 1970s. Port assignment likely dates from an era when everything got a port number, just in case.
• UDP: raid-sf — Listed in the registry with no meaningful documentation attached.

Neither registration comes with an RFC. Neither is in active use in any recognizable deployment. They're the port registry's equivalent of reserved parking spots that nobody has shown up to claim.

The Citrix Exception

Despite the dormant official registrations, port 2014 shows up in real networks for a specific reason: Citrix Command Center uses it for TCP communication between its management server and High Availability (HA) peer servers.¹

This is common behavior for enterprise software. Vendors need a port, they pick one that isn't actively occupied by something they care about, and they document it in their own configuration guides rather than petitioning IANA. The official registry says "troff." Citrix says "HA communication." Both are technically true.

If you see TCP traffic on port 2014 inside a data center, a Citrix management deployment is the most likely explanation.

Checking What's on This Port

If you encounter port 2014 on a system you manage:

# Linux/macOS — show what process is listening
ss -tlnp | grep 2014
# or
lsof -i :2014

# Windows — show listening process with PID
netstat -ano | findstr :2014

Cross-reference the PID against your process list. On a Citrix-managed system, the listener will be a Citrix Command Center process. On anything else, investigate.

Why Unassigned Ports Matter

The registered port range contains 48,128 possible ports. IANA has formally assigned a fraction of them. The rest exist in a gray zone: not officially claimed, not guaranteed to be empty.

This matters because:

• Security tools treat unexpected listeners as anomalies. A process listening on an "unassigned" port stands out in a port scan or audit. That's useful — it's exactly the signal you want when something unauthorized starts a listener.
• Vendors fill the vacuum. Without official assignments, software developers pick ports based on availability and convention. Port 2014 is a small example of how the de facto registry (what software actually uses) diverges from the formal one.
• The registry reflects history, not reality. Entries like "troff" persist because removing them requires someone to care enough to petition IANA for removal. Nobody does.

Port 2014 isn't interesting because of what it does. It's interesting because of the gap between what the registry says and what actually runs on it — a gap that exists across hundreds of registered ports.