CyberHunter
Local dataset, no network
// Other services

Port 1750: Simple Socket Library's PortMaster

Port 1750 is assigned by IANA to sslp (Simple Socket Library's PortMaster).

1750

How sslp works

Other services
client:1750sslpresponse client:1750sslpresponse

The client sends a request to port 1750 and the sslp 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 1750 dangerous?

We have no specific security note for port 1750. 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 1750

ServicePortTransportDescriptionReferenceUpdated
sslp 1750 TCP, UDP Simple Socket Library's PortMaster - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1750, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1750'      # process listening on 1750
sudo lsof -nP -i :1750

macOS

sudo lsof -nP -i :1750

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1750 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1750
netstat -ano | findstr :1750

From another machine

nmap -p 1750 -sV <host>
sudo nmap -sU -p 1750 <host>
nc -zv <host> 1750

Block it in the firewall

sudo ufw deny 1750/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1750" -Direction Inbound -LocalPort 1750 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1750 used for?

Port 1750 is assigned by IANA to sslp (Simple Socket Library's PortMaster).

Is port 1750 TCP or UDP?

Port 1750 is registered for TCP and UDP.

Is it safe to open port 1750?

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 1750 is open?

On Linux run "ss -ltnup 'sport = :1750'", on macOS "lsof -nP -i :1750", and on Windows "netstat -ano | findstr :1750" to see the local process. From another machine, "nmap -p 1750 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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