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// Other services

Port 4116: smartcard-TLS

Port 4116 is assigned by IANA to smartcard-tls (smartcard-TLS).

4116

How smartcard-tls works

Other services
client:4116smartcard-tlsresponse client:4116smartcard-tlsresponse

The client sends a request to port 4116 and the smartcard-tls 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 4116 dangerous?

We have no specific security note for port 4116. 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 4116

ServicePortTransportDescriptionReferenceUpdated
smartcard-tls 4116 TCP, UDP smartcard-TLS - 2006-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 4116, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4116'      # process listening on 4116
sudo lsof -nP -i :4116

macOS

sudo lsof -nP -i :4116

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4116 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4116
netstat -ano | findstr :4116

From another machine

nmap -p 4116 -sV <host>
sudo nmap -sU -p 4116 <host>
nc -zv <host> 4116

Block it in the firewall

sudo ufw deny 4116/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4116" -Direction Inbound -LocalPort 4116 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4116 used for?

Port 4116 is assigned by IANA to smartcard-tls (smartcard-TLS).

Is port 4116 TCP or UDP?

Port 4116 is registered for TCP and UDP.

Is it safe to open port 4116?

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 4116 is open?

On Linux run "ss -ltnup 'sport = :4116'", on macOS "lsof -nP -i :4116", and on Windows "netstat -ano | findstr :4116" to see the local process. From another machine, "nmap -p 4116 <host>" shows whether it is reachable.

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