CyberHunter
Local dataset, no network
// Other services

Port 4403: ASIGRA Televaulting DS-Client Monitoring/Management

Port 4403 is assigned by IANA to ds-user (ASIGRA Televaulting DS-Client Monitoring/Management).

4403

How ds-user works

Other services
client:4403ds-userresponse client:4403ds-userresponse

The client sends a request to port 4403 and the ds-user 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 4403 dangerous?

We have no specific security note for port 4403. 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 4403

ServicePortTransportDescriptionReferenceUpdated
ds-user 4403 TCP, UDP ASIGRA Televaulting DS-Client Monitoring/Management - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4403, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4403'      # process listening on 4403
sudo lsof -nP -i :4403

macOS

sudo lsof -nP -i :4403

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4403 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4403
netstat -ano | findstr :4403

From another machine

nmap -p 4403 -sV <host>
sudo nmap -sU -p 4403 <host>
nc -zv <host> 4403

Block it in the firewall

sudo ufw deny 4403/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4403" -Direction Inbound -LocalPort 4403 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4403 used for?

Port 4403 is assigned by IANA to ds-user (ASIGRA Televaulting DS-Client Monitoring/Management).

Is port 4403 TCP or UDP?

Port 4403 is registered for TCP and UDP.

Is it safe to open port 4403?

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 4403 is open?

On Linux run "ss -ltnup 'sport = :4403'", on macOS "lsof -nP -i :4403", and on Windows "netstat -ano | findstr :4403" to see the local process. From another machine, "nmap -p 4403 <host>" shows whether it is reachable.

05 Related
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