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// Other services

Port 2361: TL1

Port 2361 is assigned by IANA to tl1 (TL1).

2361

How tl1 works

Other services
client:2361tl1response client:2361tl1response

The client sends a request to port 2361 and the tl1 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 2361 dangerous?

We have no specific security note for port 2361. 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 2361

ServicePortTransportDescriptionReferenceUpdated
tl1 2361 TCP, UDP TL1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2361, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2361'      # process listening on 2361
sudo lsof -nP -i :2361

macOS

sudo lsof -nP -i :2361

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2361 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2361
netstat -ano | findstr :2361

From another machine

nmap -p 2361 -sV <host>
sudo nmap -sU -p 2361 <host>
nc -zv <host> 2361

Block it in the firewall

sudo ufw deny 2361/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2361" -Direction Inbound -LocalPort 2361 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2361 used for?

Port 2361 is assigned by IANA to tl1 (TL1).

Is port 2361 TCP or UDP?

Port 2361 is registered for TCP and UDP.

Is it safe to open port 2361?

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 2361 is open?

On Linux run "ss -ltnup 'sport = :2361'", on macOS "lsof -nP -i :2361", and on Windows "netstat -ano | findstr :2361" to see the local process. From another machine, "nmap -p 2361 <host>" shows whether it is reachable.

05 Related
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