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// Web

Port 7677: Sun App Server - HTTPS

Port 7677 is assigned by IANA to sun-user-https (Sun App Server - HTTPS).

7677

How sun-user-https works

Web
browser:7677sun-user-https browser:7677sun-user-https

A browser sends an HTTP request to port 7677 and the sun-user-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 7677 dangerous?

We have no specific security note for port 7677. 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 7677

ServicePortTransportDescriptionReferenceUpdated
sun-user-https 7677 TCP, UDP Sun App Server - HTTPS - 2005-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 7677, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7677'      # process listening on 7677
sudo lsof -nP -i :7677

macOS

sudo lsof -nP -i :7677

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7677 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7677
netstat -ano | findstr :7677

From another machine

nmap -p 7677 -sV <host>
sudo nmap -sU -p 7677 <host>
nc -zv <host> 7677

Block it in the firewall

sudo ufw deny 7677/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7677" -Direction Inbound -LocalPort 7677 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7677 used for?

Port 7677 is assigned by IANA to sun-user-https (Sun App Server - HTTPS).

Is port 7677 TCP or UDP?

Port 7677 is registered for TCP and UDP.

Is it safe to open port 7677?

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 7677 is open?

On Linux run "ss -ltnup 'sport = :7677'", on macOS "lsof -nP -i :7677", and on Windows "netstat -ano | findstr :7677" to see the local process. From another machine, "nmap -p 7677 <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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