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// Other services

Port 4108: ACCEL

Port 4108 is assigned by IANA to accel (ACCEL).

4108

How accel works

Other services
client:4108accelresponse client:4108accelresponse

The client sends a request to port 4108 and the accel 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 4108 dangerous?

We have no specific security note for port 4108. 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 4108

ServicePortTransportDescriptionReferenceUpdated
accel 4108 TCP, UDP ACCEL - 2006-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 4108, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4108'      # process listening on 4108
sudo lsof -nP -i :4108

macOS

sudo lsof -nP -i :4108

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4108 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4108
netstat -ano | findstr :4108

From another machine

nmap -p 4108 -sV <host>
sudo nmap -sU -p 4108 <host>
nc -zv <host> 4108

Block it in the firewall

sudo ufw deny 4108/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4108" -Direction Inbound -LocalPort 4108 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4108 used for?

Port 4108 is assigned by IANA to accel (ACCEL).

Is port 4108 TCP or UDP?

Port 4108 is registered for TCP and UDP.

Is it safe to open port 4108?

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 4108 is open?

On Linux run "ss -ltnup 'sport = :4108'", on macOS "lsof -nP -i :4108", and on Windows "netstat -ano | findstr :4108" to see the local process. From another machine, "nmap -p 4108 <host>" shows whether it is reachable.

05 Related
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