Port 557

openvms-sysipc · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Serviceopenvms-sysipc

Frequently asked questions

What is port 557 used for?

Port 557 is registered with the IANA for openvms-sysipc (TCP/UDP). Description: openvms-sysipc.

Is port 557 a well-known port?

Yes. Port 557 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.

How do I check whether port 557 is open?

Locally on Linux with ss -tulpn | grep ':557\b', on Windows with netstat -ano | findstr :557. To test a remote host use Test-NetConnection <host> -Port 557 in PowerShell or nc -zv <host> 557 on Linux/macOS.

How do I open port 557 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 557/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=557/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 557" -Direction Inbound -Protocol TCP -LocalPort 557 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPopenvms-sysipcopenvms-sysipc
UDPopenvms-sysipcopenvms-sysipc

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