CyberHunter
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// Other services

Port 4017: Talarian Mcast

Port 4017 is assigned by IANA to talarian-mcast3 (Talarian Mcast).

4017

How talarian-mcast3 works

Other services
client:4017talarian-mcast3response client:4017talarian-mcast3response

The client sends a request to port 4017 and the talarian-mcast3 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 4017 dangerous?

We have no specific security note for port 4017. 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 4017

ServicePortTransportDescriptionReferenceUpdated
talarian-mcast3 4017 TCP, UDP Talarian Mcast - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4017, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4017'      # process listening on 4017
sudo lsof -nP -i :4017

macOS

sudo lsof -nP -i :4017

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4017 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4017
netstat -ano | findstr :4017

From another machine

nmap -p 4017 -sV <host>
sudo nmap -sU -p 4017 <host>
nc -zv <host> 4017

Block it in the firewall

sudo ufw deny 4017/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4017" -Direction Inbound -LocalPort 4017 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4017 used for?

Port 4017 is assigned by IANA to talarian-mcast3 (Talarian Mcast).

Is port 4017 TCP or UDP?

Port 4017 is registered for TCP and UDP.

Is it safe to open port 4017?

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 4017 is open?

On Linux run "ss -ltnup 'sport = :4017'", on macOS "lsof -nP -i :4017", and on Windows "netstat -ano | findstr :4017" to see the local process. From another machine, "nmap -p 4017 <host>" shows whether it is reachable.

05 Related
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