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// Other services

Port 7743: Sakura Script Transfer Protocol

Port 7743 is assigned by IANA to sstp-1 (Sakura Script Transfer Protocol).

7743

How sstp-1 works

Other services
client:7743sstp-1response client:7743sstp-1response

The client sends a request to port 7743 and the sstp-1 service answers.

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
Other services
01 Security

Is port 7743 dangerous?

We have no specific security note for port 7743. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 7743

ServicePortTransportDescriptionReferenceUpdated
sstp-1 7743 TCP, UDP Sakura Script Transfer Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 7743, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7743'      # process listening on 7743
sudo lsof -nP -i :7743

macOS

sudo lsof -nP -i :7743

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7743 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7743
netstat -ano | findstr :7743

From another machine

nmap -p 7743 -sV <host>
sudo nmap -sU -p 7743 <host>
nc -zv <host> 7743

Block it in the firewall

sudo ufw deny 7743/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7743" -Direction Inbound -LocalPort 7743 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7743 used for?

Port 7743 is assigned by IANA to sstp-1 (Sakura Script Transfer Protocol).

Is port 7743 TCP or UDP?

Port 7743 is registered for TCP and UDP.

Is it safe to open port 7743?

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. Close the port if nothing on the host needs it.

How do I check if port 7743 is open?

On Linux run "ss -ltnup 'sport = :7743'", on macOS "lsof -nP -i :7743", and on Windows "netstat -ano | findstr :7743" to see the local process. From another machine, "nmap -p 7743 <host>" shows whether it is reachable.

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