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// Web

Port 4849: App Server - Admin HTTPS

Port 4849 is assigned by IANA to appserv-https (App Server - Admin HTTPS).

4849

How appserv-https works

Web
browser:4849appserv-https browser:4849appserv-https

A browser sends an HTTP request to port 4849 and the appserv-https server sends the page back.

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
Web
01 Security

Is port 4849 dangerous?

We have no specific security note for port 4849. 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 4849

ServicePortTransportDescriptionReferenceUpdated
appserv-https 4849 TCP, UDP App Server - Admin HTTPS - 2002-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 4849, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4849'      # process listening on 4849
sudo lsof -nP -i :4849

macOS

sudo lsof -nP -i :4849

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4849 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4849
netstat -ano | findstr :4849

From another machine

nmap -p 4849 -sV <host>
sudo nmap -sU -p 4849 <host>
nc -zv <host> 4849

Block it in the firewall

sudo ufw deny 4849/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4849" -Direction Inbound -LocalPort 4849 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4849 used for?

Port 4849 is assigned by IANA to appserv-https (App Server - Admin HTTPS).

Is port 4849 TCP or UDP?

Port 4849 is registered for TCP and UDP.

Is it safe to open port 4849?

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 4849 is open?

On Linux run "ss -ltnup 'sport = :4849'", on macOS "lsof -nP -i :4849", and on Windows "netstat -ano | findstr :4849" to see the local process. From another machine, "nmap -p 4849 <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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