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// Other services

Port 117: UUCP Path Service

Port 117 is assigned by IANA to uucp-path (UUCP Path Service).

117

How uucp-path works

Other services
client:117uucp-pathresponse client:117uucp-pathresponse

The client sends a request to port 117 and the uucp-path 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 117 dangerous?

We have no specific security note for port 117. 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 117

ServicePortTransportDescriptionReferenceUpdated
uucp-path 117 TCP, UDP UUCP Path Service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 117, and is it reachable?

Linux

sudo ss -ltnup 'sport = :117'      # process listening on 117
sudo lsof -nP -i :117

macOS

sudo lsof -nP -i :117

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 117 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 117
netstat -ano | findstr :117

From another machine

nmap -p 117 -sV <host>
sudo nmap -sU -p 117 <host>
nc -zv <host> 117

Block it in the firewall

sudo ufw deny 117/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 117" -Direction Inbound -LocalPort 117 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 117 used for?

Port 117 is assigned by IANA to uucp-path (UUCP Path Service).

Is port 117 TCP or UDP?

Port 117 is registered for TCP and UDP.

Is it safe to open port 117?

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 117 is open?

On Linux run "ss -ltnup 'sport = :117'", on macOS "lsof -nP -i :117", and on Windows "netstat -ano | findstr :117" to see the local process. From another machine, "nmap -p 117 <host>" shows whether it is reachable.

05 Related
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