CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Web

Port 6786: Sun Java Web Console JMX

Port 6786 is assigned by IANA to smc-jmx (Sun Java Web Console JMX).

6786

How smc-jmx works

Web
browser:6786smc-jmx browser:6786smc-jmx

A browser sends an HTTP request to port 6786 and the smc-jmx 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 6786 dangerous?

We have no specific security note for port 6786. 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 6786

ServicePortTransportDescriptionReferenceUpdated
smc-jmx 6786 TCP, UDP Sun Java Web Console JMX - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 6786, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6786'      # process listening on 6786
sudo lsof -nP -i :6786

macOS

sudo lsof -nP -i :6786

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6786 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6786
netstat -ano | findstr :6786

From another machine

nmap -p 6786 -sV <host>
sudo nmap -sU -p 6786 <host>
nc -zv <host> 6786

Block it in the firewall

sudo ufw deny 6786/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6786" -Direction Inbound -LocalPort 6786 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6786 used for?

Port 6786 is assigned by IANA to smc-jmx (Sun Java Web Console JMX).

Is port 6786 TCP or UDP?

Port 6786 is registered for TCP and UDP.

Is it safe to open port 6786?

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 6786 is open?

On Linux run "ss -ltnup 'sport = :6786'", on macOS "lsof -nP -i :6786", and on Windows "netstat -ano | findstr :6786" to see the local process. From another machine, "nmap -p 6786 <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

Latest vulnerability news

All news