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// Web

Port 2408: CloudFlare Railgun Web Acceleration Protocol

Port 2408 is assigned by IANA to railgun-webaccl (CloudFlare Railgun Web Acceleration Protocol).

2408

How railgun-webaccl works

Web
browser:2408railgun-webaccl browser:2408railgun-webaccl

A browser sends an HTTP request to port 2408 and the railgun-webaccl server sends the page back.

Transport
TCP
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
Web
01 Security

Is port 2408 dangerous?

We have no specific security note for port 2408. Its risk depends on the program actually listening on it. General advice for web services:

  • Serve it over HTTPS only and check the HTTP security headers.
  • Keep admin consoles and development servers off the Internet.
  • Patch the application server and remove default credentials and sample apps.
02 Registry

IANA registry entries for port 2408

ServicePortTransportDescriptionReferenceUpdated
railgun-webaccl 2408 TCP CloudFlare Railgun Web Acceleration Protocol - 2012-03-09
-2408-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 2408, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2408'      # process listening on 2408
sudo lsof -nP -i :2408

macOS

sudo lsof -nP -i :2408

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2408 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2408
netstat -ano | findstr :2408

From another machine

nmap -p 2408 -sV <host>
nc -zv <host> 2408

Block it in the firewall

sudo ufw deny 2408/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2408" -Direction Inbound -LocalPort 2408 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2408 used for?

Port 2408 is assigned by IANA to railgun-webaccl (CloudFlare Railgun Web Acceleration Protocol).

Is port 2408 TCP or UDP?

Port 2408 is registered for TCP.

Is it safe to open port 2408?

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. Serve it over HTTPS only and check the HTTP security headers.

How do I check if port 2408 is open?

On Linux run "ss -ltnup 'sport = :2408'", on macOS "lsof -nP -i :2408", and on Windows "netstat -ano | findstr :2408" to see the local process. From another machine, "nmap -p 2408 <host>" shows whether it is reachable.

05 Related
:443 HTTPS tcp · udp · sctp · low risk :80 HTTP tcp · udp · sctp · moderate risk :8080 HTTP alternate tcp · udp · high risk :8443 HTTPS alternate tcp · udp · moderate risk :3000 Dev servers / Grafana tcp · udp · moderate risk :5000 Flask / Docker registry / UPnP tcp · udp · moderate risk :8000 HTTP alternate (dev) tcp · udp · moderate risk :8888 Jupyter / HTTP alternate tcp · udp · high risk

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