- 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.
Port 777: Multiling HTTP
Port 777 is assigned by IANA to multiling-http (Multiling HTTP).
777
How multiling-http works
WebA browser sends an HTTP request to port 777 and the multiling-http 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
- Well-known (0-1023)
- Category
- Web
Is port 777 dangerous?
We have no specific security note for port 777. Its risk depends on the program actually listening on it. General advice for web services:
IANA registry entries for port 777
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| multiling-http | 777 | TCP, UDP | Multiling HTTP | - | - |
// source: IANA service name and port number registry
Which program uses port 777, and is it reachable?
Linux
sudo ss -ltnup 'sport = :777' # process listening on 777
sudo lsof -nP -i :777macOS
sudo lsof -nP -i :777
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 777 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 777 netstat -ano | findstr :777
From another machine
nmap -p 777 -sV <host> sudo nmap -sU -p 777 <host> nc -zv <host> 777
Block it in the firewall
sudo ufw deny 777/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 777" -Direction Inbound -LocalPort 777 -Protocol TCP -Action Block # Windows
What is port 777 used for?
Port 777 is assigned by IANA to multiling-http (Multiling HTTP).
Is port 777 TCP or UDP?
Port 777 is registered for TCP and UDP.
Is it safe to open port 777?
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 777 is open?
On Linux run "ss -ltnup 'sport = :777'", on macOS "lsof -nP -i :777", and on Windows "netstat -ano | findstr :777" to see the local process. From another machine, "nmap -p 777 <host>" shows whether it is reachable.
Other web ports
: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