What This Port Does
Port 2548 is the management port for EVault backup agents — the software that silently backs up your data in the background. When the Cloud Backup Portal needs to connect to the agent to configure it, check its status, or issue commands, it reaches in on TCP port 2548.
The agent listens. The portal connects. Backup happens.
The Name
IANA registered this port as vytalvaultpipe — a name that traces back to Vytal Networks, an early enterprise backup company. Their product created a named pipe protocol for communication between their vault software and its clients. The company and product evolved; EVault acquired or absorbed the technology; IBM eventually acquired EVault and folded it into IBM Cloud Backup. The port number stayed put.
"Vytalvaultpipe" is now a fossil — the IANA entry preserving the name of a company most people have never heard of, for a product that no longer carries that name.
How It Works in Practice
IBM Cloud Backup documentation is explicit about it1:
The agent must allow TCP port 2548 inbound on the private network. This setting allows Cloud Backup Portal to connect into the agent to manage it.
The key word is inbound. The backup agent opens this port and waits. The portal initiates. This is the reverse of how most people think about backup — you'd expect the agent to push data outward, but the management plane works the other direction: the controller reaches in.
On Windows, the port is stored in the registry at:
Which means it can be changed — and in some enterprise environments, it is.
The Range
Port 2548 sits in the registered port range (1024–49151). These ports are:
- Not reserved for operating system use (that's 0–1023, the well-known ports)
- Registered with IANA by organizations that have a legitimate, documented use
- Not guaranteed to be exclusive in practice — software can bind to any available port
Registration means IANA has a record. It doesn't mean the software is common, secure, or still actively developed.
Who Encounters This Port
Mostly: enterprise environments running EVault or IBM Cloud Backup agents. If you see port 2548 listening on a server, you're almost certainly looking at a backup agent.
If you see it on a machine that shouldn't be running backup software, that's worth investigating.
How to Check What's Listening on Port 2548
Linux/macOS:
Windows:
The output will show the process ID. Cross-reference with Task Manager or tasklist to identify what's running.
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