What Port 3673 Is
Port 3673 is registered in the IANA Service Name and Transport Protocol Port Number Registry as mediavault-gui — the graphical management interface for HP's Openview Media Vault.1
It runs on both TCP and UDP. It was registered in January 2003.
The Product Behind the Port
HP's Media Vault was a network-attached storage device aimed at home users and small businesses. You plugged it into your router, and it became a shared drive for everyone on the network — file storage, backups, media streaming. Think of it as an early, consumer-grade NAS box before the term "NAS" became common vocabulary.
Port 3673 was reserved for its web-based management GUI: the browser interface you'd use to configure the device, set up shares, and manage users. The kind of admin panel that, in 2003, felt like a small miracle.
The product line is discontinued. If you have one running somewhere, it's a remarkable feat of hardware longevity. If you see port 3673 open on a modern system, it's almost certainly something else using the port opportunistically, not an HP Media Vault.
The Registered Port Range
Port 3673 sits in the registered ports range: 1024–49151.
These ports are neither owned by the operating system (like well-known ports below 1024) nor randomly assigned for ephemeral connections (like dynamic ports above 49151). They're the middle ground — ports that vendors register with IANA to claim space for their applications, so two products don't accidentally collide on the same number.2
Registration is not enforcement. IANA records the assignment, but nothing stops other software from using port 3673. When a vendor's product disappears, the registration stays. The port becomes available in practice even as it remains spoken for on paper.
If You See Port 3673 Open
You're almost certainly not looking at an HP Media Vault. Check what's actually listening:
On Linux/macOS:
On Windows:
Cross-reference the process ID against your running services. It's likely custom software, a development server, or a misconfigured application that landed on this port by chance or convenience.
Why Ports Like This Matter
The IANA registry is full of port 3673s — registrations made in good faith for products that no longer exist. They represent a quiet truth about the registered port space: it's a historical record as much as an operational one.
This matters for security. An unfamiliar open port is worth investigating regardless of what the registry says. "IANA says this belongs to a discontinued NAS product" is not a satisfying explanation for why port 3673 is open on your production server.
When in doubt, check what's listening. The registry tells you what was intended. lsof tells you what's true.
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