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// Other services

Port 3117: MCTET Jserv

Port 3117 is assigned by IANA to mctet-jserv (MCTET Jserv).

3117

How mctet-jserv works

Other services
client:3117mctet-jservresponse client:3117mctet-jservresponse

The client sends a request to port 3117 and the mctet-jserv 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 3117 dangerous?

We have no specific security note for port 3117. 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 3117

ServicePortTransportDescriptionReferenceUpdated
mctet-jserv 3117 TCP, UDP MCTET Jserv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3117, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3117'      # process listening on 3117
sudo lsof -nP -i :3117

macOS

sudo lsof -nP -i :3117

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3117 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3117
netstat -ano | findstr :3117

From another machine

nmap -p 3117 -sV <host>
sudo nmap -sU -p 3117 <host>
nc -zv <host> 3117

Block it in the firewall

sudo ufw deny 3117/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3117" -Direction Inbound -LocalPort 3117 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3117 used for?

Port 3117 is assigned by IANA to mctet-jserv (MCTET Jserv).

Is port 3117 TCP or UDP?

Port 3117 is registered for TCP and UDP.

Is it safe to open port 3117?

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 3117 is open?

On Linux run "ss -ltnup 'sport = :3117'", on macOS "lsof -nP -i :3117", and on Windows "netstat -ano | findstr :3117" to see the local process. From another machine, "nmap -p 3117 <host>" shows whether it is reachable.

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