CyberHunter
Local dataset, no network
// Other services

Port 7903: TNOS Secure DiaguardProtocol

Port 7903 is assigned by IANA to tnos-dps (TNOS Secure DiaguardProtocol).

7903

How tnos-dps works

Other services
client:7903tnos-dpsresponse client:7903tnos-dpsresponse

The client sends a request to port 7903 and the tnos-dps 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 7903 dangerous?

We have no specific security note for port 7903. 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 7903

ServicePortTransportDescriptionReferenceUpdated
tnos-dps 7903 TCP, UDP TNOS Secure DiaguardProtocol - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 7903, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7903'      # process listening on 7903
sudo lsof -nP -i :7903

macOS

sudo lsof -nP -i :7903

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7903 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7903
netstat -ano | findstr :7903

From another machine

nmap -p 7903 -sV <host>
sudo nmap -sU -p 7903 <host>
nc -zv <host> 7903

Block it in the firewall

sudo ufw deny 7903/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7903" -Direction Inbound -LocalPort 7903 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7903 used for?

Port 7903 is assigned by IANA to tnos-dps (TNOS Secure DiaguardProtocol).

Is port 7903 TCP or UDP?

Port 7903 is registered for TCP and UDP.

Is it safe to open port 7903?

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 7903 is open?

On Linux run "ss -ltnup 'sport = :7903'", on macOS "lsof -nP -i :7903", and on Windows "netstat -ano | findstr :7903" to see the local process. From another machine, "nmap -p 7903 <host>" shows whether it is reachable.

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