Port 159

nss-routing · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Servicenss-routing

Frequently asked questions

What is port 159 used for?

Port 159 is registered with the IANA for nss-routing (TCP/UDP). Description: NSS-Routing.

Is port 159 a well-known port?

Yes. Port 159 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 159 is open?

Locally on Linux with ss -tulpn | grep ':159\b', on Windows with netstat -ano | findstr :159. To test a remote host use Test-NetConnection <host> -Port 159 in PowerShell or nc -zv <host> 159 on Linux/macOS.

How do I open port 159 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 159/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=159/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 159" -Direction Inbound -Protocol TCP -LocalPort 159 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPnss-routingNSS-Routing
UDPnss-routingNSS-Routing

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