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// Other services

Port 369: rpc2portmap

Port 369 is assigned by IANA to rpc2portmap (rpc2portmap).

369

How rpc2portmap works

Other services
client:369rpc2portmapresponse client:369rpc2portmapresponse

The client sends a request to port 369 and the rpc2portmap 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 369 dangerous?

We have no specific security note for port 369. 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 369

ServicePortTransportDescriptionReferenceUpdated
rpc2portmap 369 TCP, UDP rpc2portmap - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 369, and is it reachable?

Linux

sudo ss -ltnup 'sport = :369'      # process listening on 369
sudo lsof -nP -i :369

macOS

sudo lsof -nP -i :369

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 369 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 369
netstat -ano | findstr :369

From another machine

nmap -p 369 -sV <host>
sudo nmap -sU -p 369 <host>
nc -zv <host> 369

Block it in the firewall

sudo ufw deny 369/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 369" -Direction Inbound -LocalPort 369 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 369 used for?

Port 369 is assigned by IANA to rpc2portmap (rpc2portmap).

Is port 369 TCP or UDP?

Port 369 is registered for TCP and UDP.

Is it safe to open port 369?

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 369 is open?

On Linux run "ss -ltnup 'sport = :369'", on macOS "lsof -nP -i :369", and on Windows "netstat -ano | findstr :369" to see the local process. From another machine, "nmap -p 369 <host>" shows whether it is reachable.

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