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// Other services

Port 3118: PKAgent

Port 3118 is assigned by IANA to pkagent (PKAgent).

3118

How pkagent works

Other services
client:3118pkagentresponse client:3118pkagentresponse

The client sends a request to port 3118 and the pkagent 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 3118 dangerous?

We have no specific security note for port 3118. 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 3118

ServicePortTransportDescriptionReferenceUpdated
pkagent 3118 TCP, UDP PKAgent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3118, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3118'      # process listening on 3118
sudo lsof -nP -i :3118

macOS

sudo lsof -nP -i :3118

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3118 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3118
netstat -ano | findstr :3118

From another machine

nmap -p 3118 -sV <host>
sudo nmap -sU -p 3118 <host>
nc -zv <host> 3118

Block it in the firewall

sudo ufw deny 3118/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3118" -Direction Inbound -LocalPort 3118 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3118 used for?

Port 3118 is assigned by IANA to pkagent (PKAgent).

Is port 3118 TCP or UDP?

Port 3118 is registered for TCP and UDP.

Is it safe to open port 3118?

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 3118 is open?

On Linux run "ss -ltnup 'sport = :3118'", on macOS "lsof -nP -i :3118", and on Windows "netstat -ano | findstr :3118" to see the local process. From another machine, "nmap -p 3118 <host>" shows whether it is reachable.

05 Related
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