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// Other services

Port 5397: StressTester(tm) Injector

Port 5397 is assigned by IANA to stresstester (StressTester(tm) Injector).

5397

How stresstester works

Other services
client:5397stresstesterresponse client:5397stresstesterresponse

The client sends a request to port 5397 and the stresstester 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 5397 dangerous?

We have no specific security note for port 5397. 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 5397

ServicePortTransportDescriptionReferenceUpdated
stresstester 5397 TCP, UDP StressTester(tm) Injector - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 5397, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5397'      # process listening on 5397
sudo lsof -nP -i :5397

macOS

sudo lsof -nP -i :5397

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5397 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5397
netstat -ano | findstr :5397

From another machine

nmap -p 5397 -sV <host>
sudo nmap -sU -p 5397 <host>
nc -zv <host> 5397

Block it in the firewall

sudo ufw deny 5397/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5397" -Direction Inbound -LocalPort 5397 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5397 used for?

Port 5397 is assigned by IANA to stresstester (StressTester(tm) Injector).

Is port 5397 TCP or UDP?

Port 5397 is registered for TCP and UDP.

Is it safe to open port 5397?

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 5397 is open?

On Linux run "ss -ltnup 'sport = :5397'", on macOS "lsof -nP -i :5397", and on Windows "netstat -ano | findstr :5397" to see the local process. From another machine, "nmap -p 5397 <host>" shows whether it is reachable.

05 Related
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