HTTPfy

Port 7743 (sstp-1)

IANA assigns port 7743 to sstp-1: Sakura Script Transfer Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sstp-1 TCP Sakura Script Transfer Protocol Kouichi Takeda -
sstp-1 UDP Sakura Script Transfer Protocol Kouichi Takeda -

Check what is listening on port 7743

Linux: is anything listening on TCP 7743?
sudo ss -tlnp 'sport = :7743'
Linux: UDP 7743
sudo ss -ulnp 'sport = :7743'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7743
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7743 '
Windows (Command Prompt)
netstat -ano | findstr :7743
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7743 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7743
From Windows
Test-NetConnection HOST -Port 7743
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7743

Block port 7743 in the firewall

ufw
sudo ufw deny 7743/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7743 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7743' -Direction Inbound -Protocol TCP -LocalPort 7743 -Action Block
ufw
sudo ufw deny 7743/udp
iptables
sudo iptables -A INPUT -p udp --dport 7743 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7743' -Direction Inbound -Protocol UDP -LocalPort 7743 -Action Block

Related ports

7741scriptview7742msss7744raqmon-pdu7747prgp

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