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// Other services

Port 2741: TSB

Port 2741 is assigned by IANA to tsb (TSB).

2741

How tsb works

Other services
client:2741tsbresponse client:2741tsbresponse

The client sends a request to port 2741 and the tsb 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 2741 dangerous?

We have no specific security note for port 2741. 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 2741

ServicePortTransportDescriptionReferenceUpdated
tsb 2741 TCP, UDP TSB - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2741, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2741'      # process listening on 2741
sudo lsof -nP -i :2741

macOS

sudo lsof -nP -i :2741

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2741 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2741
netstat -ano | findstr :2741

From another machine

nmap -p 2741 -sV <host>
sudo nmap -sU -p 2741 <host>
nc -zv <host> 2741

Block it in the firewall

sudo ufw deny 2741/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2741" -Direction Inbound -LocalPort 2741 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2741 used for?

Port 2741 is assigned by IANA to tsb (TSB).

Is port 2741 TCP or UDP?

Port 2741 is registered for TCP and UDP.

Is it safe to open port 2741?

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 2741 is open?

On Linux run "ss -ltnup 'sport = :2741'", on macOS "lsof -nP -i :2741", and on Windows "netstat -ano | findstr :2741" to see the local process. From another machine, "nmap -p 2741 <host>" shows whether it is reachable.

05 Related
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