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// Other services

Port 1303: sftsrv

Port 1303 is assigned by IANA to sftsrv (sftsrv).

1303

How sftsrv works

Other services
client:1303sftsrvresponse client:1303sftsrvresponse

The client sends a request to port 1303 and the sftsrv 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 1303 dangerous?

We have no specific security note for port 1303. 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 1303

ServicePortTransportDescriptionReferenceUpdated
sftsrv 1303 TCP, UDP sftsrv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1303, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1303'      # process listening on 1303
sudo lsof -nP -i :1303

macOS

sudo lsof -nP -i :1303

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1303 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1303
netstat -ano | findstr :1303

From another machine

nmap -p 1303 -sV <host>
sudo nmap -sU -p 1303 <host>
nc -zv <host> 1303

Block it in the firewall

sudo ufw deny 1303/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1303" -Direction Inbound -LocalPort 1303 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1303 used for?

Port 1303 is assigned by IANA to sftsrv (sftsrv).

Is port 1303 TCP or UDP?

Port 1303 is registered for TCP and UDP.

Is it safe to open port 1303?

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 1303 is open?

On Linux run "ss -ltnup 'sport = :1303'", on macOS "lsof -nP -i :1303", and on Windows "netstat -ano | findstr :1303" to see the local process. From another machine, "nmap -p 1303 <host>" shows whether it is reachable.

05 Related
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