What Port 2147 Is
Port 2147 sits in the registered port range — the stretch from 1024 to 49151 where IANA keeps an official log of which application claimed which number. IANA's registry lists port 2147 as lv-auth: Live Vault Authentication, for both TCP and UDP.1
Live Vault was an online backup service — think continuous, agent-based server backups shipped offsite. Iron Mountain acquired it in the mid-2000s. The service later became CyberFortress.2
The Curious Part
LiveVault's own firewall documentation lists the ports you need to open for the service: 2144 for vault connections, 2145 for bridge connections, 443 for provisioning.3 Port 2147 doesn't appear.
This happens more often than you'd expect. A company requests a port registration from IANA during development or early deployment. The product ships, architectures shift, the authentication flow moves to a different port or gets folded into TLS on 443 — and the registered port number becomes a historical artifact. IANA keeps it in the registry indefinitely. The software quietly stops using it.
Port 2147 may have carried authentication traffic in an early version of LiveVault that no longer exists in that form. Or it may have been registered speculatively and never deployed at scale. The honest answer: we don't know, and LiveVault's documentation doesn't say.
What This Port Range Means
The registered port range (1024–49151) is where applications go to stake a claim. Unlike the well-known ports below 1024 — which require root privileges on Unix systems and carry protocols like HTTP, SSH, and DNS — registered ports can be used by any process. IANA registration is voluntary and largely advisory: it documents intent but doesn't enforce exclusivity. Two different applications can and do use the same registered port on different machines.
If you see port 2147 open on a system, the most likely explanation is LiveVault or its descendants. But any application can bind to it.
How to Check What's Listening
On Linux or macOS:
On Windows:
The process ID in the output can be cross-referenced in Task Manager or with tasklist /fi "pid eq <PID>" to identify what's actually running.
Why Unassigned (and Lightly Used) Ports Matter
The port registry is a coordination mechanism, not an enforcement mechanism. When port 2147 shows up in a firewall log or a port scan, the registration gives you a starting hypothesis — "this might be Live Vault" — even if that hypothesis turns out to be wrong.
That's the practical value of IANA's registry. Not law, but signal. A first guess that's often right enough to save time.
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