Port 1625: HP Data Protector — Where backup servers coordinate recovery

What Runs Here

Port 1625 is the registered port for HP Data Protector (now Micro Focus Data Protector), enterprise backup and disaster recovery software. This port handles communication between the backup server and client agents during backup and restore operations.¹

When a backup runs in a large organization—protecting hundreds of servers, databases, and applications—port 1625 is where the coordination happens. The backup server sends instructions, agents report status, and the entire operation orchestrates itself through this channel.

How Data Protector Works

Data Protector uses a Cell Manager architecture. The Cell Manager controls backup operations across all systems in the "cell"—the collection of servers, agents, and storage devices managed together.

Port 1625 is where these components talk to each other:

• The Cell Manager sends backup schedules and instructions to agents
• Agents on client machines report what needs backing up
• Status updates flow back: what succeeded, what failed, how much data moved

The actual backup data doesn't flow through this port—that uses different channels. Port 1625 is the control plane, not the data plane.

The Registered Port Range

Port 1625 lives in the registered port range (1024-49151). IANA maintains this range for services that vendors request.² HP registered 1625 for Data Protector so enterprises could configure firewalls knowing this port needs to be open between backup servers and protected systems.

Unlike well-known ports (0-1023), registered ports don't require special privileges to bind to. Any application can listen on 1625, but in enterprise environments where Data Protector runs, this port is typically reserved for backup operations.

Security Considerations

HP Data Protector has a troubled security history. The software has accumulated dozens of vulnerabilities over the years—enough that it has dedicated sections in exploit databases.³⁴

The good news: most exploits targeted port 5555, not 1625. The bad news: if you're running Data Protector, you need to keep it updated and monitor for suspicious activity on all its ports.

Check what's listening on port 1625:

# Linux/macOS
sudo lsof -i :1625
sudo netstat -tulpn | grep 1625

# Windows
netstat -ano | findstr :1625

If you see something on this port and you're not running Data Protector, investigate. Unregistered services shouldn't be using registered ports.

Why This Port Matters

Port 1625 represents something important about enterprise infrastructure: backups run on trust. The backup server needs access to every critical system. The agents need permission to read every important file. Port 1625 carries those privileged communications.

This is why backup software gets targeted. Compromise the backup system and you compromise everything it protects. That's the paradox: the thing designed to save you from disaster can become the vector for one.

Every night, across thousands of enterprises, port 1625 carries the instructions that protect data from loss. It's not glamorous. It's not fast. But when disaster strikes—ransomware, hardware failure, human error—those backups that coordinated through port 1625 are the difference between recovery and catastrophe.

Related Ports

• Port 5555 — HP Data Protector's primary service port (historically vulnerable)
• Port 5556 — Data Protector encrypted control communication
• Ports 7000-7999 — Data Protector media operations