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Port 6771 (plysrv-https)

IANA assigns port 6771 to plysrv-https: PolyServe https.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
plysrv-https TCP PolyServe https Mike Spitzer -
plysrv-https UDP PolyServe https Mike Spitzer -

Registry dates for this port: registered 2005-08.

Check what is listening on port 6771

Linux: is anything listening on TCP 6771?
sudo ss -tlnp 'sport = :6771'
Linux: UDP 6771
sudo ss -ulnp 'sport = :6771'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6771
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6771 '
Windows (Command Prompt)
netstat -ano | findstr :6771
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6771 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6771
From Windows
Test-NetConnection HOST -Port 6771
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6771

Block port 6771 in the firewall

ufw
sudo ufw deny 6771/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6771 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6771 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6771' -Direction Inbound -Protocol TCP -LocalPort 6771 -Action Block
ufw
sudo ufw deny 6771/udp
iptables
sudo iptables -A INPUT -p udp --dport 6771 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6771 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6771' -Direction Inbound -Protocol UDP -LocalPort 6771 -Action Block

Related ports

6769adi-gxp-srvprt6770plysrv-http6777ntz-tracker6778ntz-p2p-storage

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.