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// Other services

Port 2156: Talari Reliable Protocol

Port 2156 is assigned by IANA to trp (Talari Reliable Protocol).

2156

How trp works

Other services
client:2156trpresponse client:2156trpresponse

The client sends a request to port 2156 and the trp 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 2156 dangerous?

We have no specific security note for port 2156. 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 2156

ServicePortTransportDescriptionReferenceUpdated
trp 2156 TCP, UDP Talari Reliable Protocol - 2007-09-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 2156, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2156'      # process listening on 2156
sudo lsof -nP -i :2156

macOS

sudo lsof -nP -i :2156

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2156 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2156
netstat -ano | findstr :2156

From another machine

nmap -p 2156 -sV <host>
sudo nmap -sU -p 2156 <host>
nc -zv <host> 2156

Block it in the firewall

sudo ufw deny 2156/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2156" -Direction Inbound -LocalPort 2156 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2156 used for?

Port 2156 is assigned by IANA to trp (Talari Reliable Protocol).

Is port 2156 TCP or UDP?

Port 2156 is registered for TCP and UDP.

Is it safe to open port 2156?

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 2156 is open?

On Linux run "ss -ltnup 'sport = :2156'", on macOS "lsof -nP -i :2156", and on Windows "netstat -ano | findstr :2156" to see the local process. From another machine, "nmap -p 2156 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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