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// Other services

Port 3755: SAS Remote Help Server

Port 3755 is assigned by IANA to sas-remote-hlp (SAS Remote Help Server).

3755

How sas-remote-hlp works

Other services
client:3755sas-remote-hlpresponse client:3755sas-remote-hlpresponse

The client sends a request to port 3755 and the sas-remote-hlp 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 3755 dangerous?

We have no specific security note for port 3755. 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 3755

ServicePortTransportDescriptionReferenceUpdated
sas-remote-hlp 3755 TCP, UDP SAS Remote Help Server - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3755, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3755'      # process listening on 3755
sudo lsof -nP -i :3755

macOS

sudo lsof -nP -i :3755

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3755 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3755
netstat -ano | findstr :3755

From another machine

nmap -p 3755 -sV <host>
sudo nmap -sU -p 3755 <host>
nc -zv <host> 3755

Block it in the firewall

sudo ufw deny 3755/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3755" -Direction Inbound -LocalPort 3755 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3755 used for?

Port 3755 is assigned by IANA to sas-remote-hlp (SAS Remote Help Server).

Is port 3755 TCP or UDP?

Port 3755 is registered for TCP and UDP.

Is it safe to open port 3755?

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 3755 is open?

On Linux run "ss -ltnup 'sport = :3755'", on macOS "lsof -nP -i :3755", and on Windows "netstat -ano | findstr :3755" to see the local process. From another machine, "nmap -p 3755 <host>" shows whether it is reachable.

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