Port 157

knet-cmp · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Serviceknet-cmp

Frequently asked questions

What is port 157 used for?

Port 157 is registered with the IANA for knet-cmp (TCP/UDP). Description: KNET/VM Command/Message Protocol.

Is port 157 a well-known port?

Yes. Port 157 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 157 is open?

Locally on Linux with ss -tulpn | grep ':157\b', on Windows with netstat -ano | findstr :157. To test a remote host use Test-NetConnection <host> -Port 157 in PowerShell or nc -zv <host> 157 on Linux/macOS.

How do I open port 157 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 157/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=157/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 157" -Direction Inbound -Protocol TCP -LocalPort 157 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPknet-cmpKNET/VM Command/Message Protocol
UDPknet-cmpKNET/VM Command/Message Protocol

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