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// Other services

Port 12753: tsaf port

Port 12753 is assigned by IANA to tsaf (tsaf port).

12753

How tsaf works

Other services
client:12753tsafresponse client:12753tsafresponse

The client sends a request to port 12753 and the tsaf 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 12753 dangerous?

We have no specific security note for port 12753. 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 12753

ServicePortTransportDescriptionReferenceUpdated
tsaf 12753 TCP, UDP tsaf port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 12753, and is it reachable?

Linux

sudo ss -ltnup 'sport = :12753'      # process listening on 12753
sudo lsof -nP -i :12753

macOS

sudo lsof -nP -i :12753

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 12753 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 12753
netstat -ano | findstr :12753

From another machine

nmap -p 12753 -sV <host>
sudo nmap -sU -p 12753 <host>
nc -zv <host> 12753

Block it in the firewall

sudo ufw deny 12753/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 12753" -Direction Inbound -LocalPort 12753 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 12753 used for?

Port 12753 is assigned by IANA to tsaf (tsaf port).

Is port 12753 TCP or UDP?

Port 12753 is registered for TCP and UDP.

Is it safe to open port 12753?

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 12753 is open?

On Linux run "ss -ltnup 'sport = :12753'", on macOS "lsof -nP -i :12753", and on Windows "netstat -ano | findstr :12753" to see the local process. From another machine, "nmap -p 12753 <host>" shows whether it is reachable.

05 Related
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