- 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 6771: PolyServe https
Port 6771 is assigned by IANA to plysrv-https (PolyServe https).
6771
How plysrv-https works
WebA browser sends an HTTP request to port 6771 and the plysrv-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
Is port 6771 dangerous?
We have no specific security note for port 6771. Its risk depends on the program actually listening on it. General advice for web services:
IANA registry entries for port 6771
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| plysrv-https | 6771 | TCP, UDP | PolyServe https | - | 2005-08 |
// source: IANA service name and port number registry
Which program uses port 6771, and is it reachable?
Linux
sudo ss -ltnup 'sport = :6771' # process listening on 6771
sudo lsof -nP -i :6771macOS
sudo lsof -nP -i :6771
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6771 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 6771 netstat -ano | findstr :6771
From another machine
nmap -p 6771 -sV <host> sudo nmap -sU -p 6771 <host> nc -zv <host> 6771
Block it in the firewall
sudo ufw deny 6771/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 6771" -Direction Inbound -LocalPort 6771 -Protocol TCP -Action Block # Windows
What is port 6771 used for?
Port 6771 is assigned by IANA to plysrv-https (PolyServe https).
Is port 6771 TCP or UDP?
Port 6771 is registered for TCP and UDP.
Is it safe to open port 6771?
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 6771 is open?
On Linux run "ss -ltnup 'sport = :6771'", on macOS "lsof -nP -i :6771", and on Windows "netstat -ano | findstr :6771" to see the local process. From another machine, "nmap -p 6771 <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