CyberHunter
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// Other services

Port 7902: TNOS shell Protocol

Port 7902 is assigned by IANA to tnos-dp (TNOS shell Protocol).

7902

How tnos-dp works

Other services
client:7902tnos-dpresponse client:7902tnos-dpresponse

The client sends a request to port 7902 and the tnos-dp 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 7902 dangerous?

We have no specific security note for port 7902. 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 7902

ServicePortTransportDescriptionReferenceUpdated
tnos-dp 7902 TCP, UDP TNOS shell Protocol - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 7902, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7902'      # process listening on 7902
sudo lsof -nP -i :7902

macOS

sudo lsof -nP -i :7902

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7902 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7902
netstat -ano | findstr :7902

From another machine

nmap -p 7902 -sV <host>
sudo nmap -sU -p 7902 <host>
nc -zv <host> 7902

Block it in the firewall

sudo ufw deny 7902/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7902" -Direction Inbound -LocalPort 7902 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7902 used for?

Port 7902 is assigned by IANA to tnos-dp (TNOS shell Protocol).

Is port 7902 TCP or UDP?

Port 7902 is registered for TCP and UDP.

Is it safe to open port 7902?

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 7902 is open?

On Linux run "ss -ltnup 'sport = :7902'", on macOS "lsof -nP -i :7902", and on Windows "netstat -ano | findstr :7902" to see the local process. From another machine, "nmap -p 7902 <host>" shows whether it is reachable.

05 Related
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