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// Other services

Port 2405: TRC Netpoll

Port 2405 is assigned by IANA to trc-netpoll (TRC Netpoll).

2405

How trc-netpoll works

Other services
client:2405trc-netpollresponse client:2405trc-netpollresponse

The client sends a request to port 2405 and the trc-netpoll 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 2405 dangerous?

We have no specific security note for port 2405. 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 2405

ServicePortTransportDescriptionReferenceUpdated
trc-netpoll 2405 TCP, UDP TRC Netpoll - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2405, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2405'      # process listening on 2405
sudo lsof -nP -i :2405

macOS

sudo lsof -nP -i :2405

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2405 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2405
netstat -ano | findstr :2405

From another machine

nmap -p 2405 -sV <host>
sudo nmap -sU -p 2405 <host>
nc -zv <host> 2405

Block it in the firewall

sudo ufw deny 2405/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2405" -Direction Inbound -LocalPort 2405 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2405 used for?

Port 2405 is assigned by IANA to trc-netpoll (TRC Netpoll).

Is port 2405 TCP or UDP?

Port 2405 is registered for TCP and UDP.

Is it safe to open port 2405?

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 2405 is open?

On Linux run "ss -ltnup 'sport = :2405'", on macOS "lsof -nP -i :2405", and on Windows "netstat -ano | findstr :2405" to see the local process. From another machine, "nmap -p 2405 <host>" shows whether it is reachable.

05 Related
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