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// Other services

Port 557: openvms-sysipc

Port 557 is assigned by IANA to openvms-sysipc (openvms-sysipc).

557

How openvms-sysipc works

Other services
client:557openvms-sysipcresponse client:557openvms-sysipcresponse

The client sends a request to port 557 and the openvms-sysipc service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 557 dangerous?

We have no specific security note for port 557. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 557

ServicePortTransportDescriptionReferenceUpdated
openvms-sysipc 557 TCP, UDP openvms-sysipc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 557, and is it reachable?

Linux

sudo ss -ltnup 'sport = :557'      # process listening on 557
sudo lsof -nP -i :557

macOS

sudo lsof -nP -i :557

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 557 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 557
netstat -ano | findstr :557

From another machine

nmap -p 557 -sV <host>
sudo nmap -sU -p 557 <host>
nc -zv <host> 557

Block it in the firewall

sudo ufw deny 557/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 557" -Direction Inbound -LocalPort 557 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 557 used for?

Port 557 is assigned by IANA to openvms-sysipc (openvms-sysipc).

Is port 557 TCP or UDP?

Port 557 is registered for TCP and UDP.

Is it safe to open port 557?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 557 is open?

On Linux run "ss -ltnup 'sport = :557'", on macOS "lsof -nP -i :557", and on Windows "netstat -ano | findstr :557" to see the local process. From another machine, "nmap -p 557 <host>" shows whether it is reachable.

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