Remote JMX Port 9001 Guide

Remote JMX Port 9001 Guide | Generated by AI

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A JMX remote agent is part of Java Management Extensions (JMX). It allows you to monitor and manage a running Java application remotely. When you enable JMX remote management, the JVM starts an agent that exposes MBeans (Managed Beans) over a TCP port. Tools like jconsole, VisualVM, or custom monitoring software can connect to that port to inspect memory usage, thread states, GC activity, and even invoke operations.

About the 9001 port:

The actual port number depends on how the application is configured. Commonly you’ll see 9001, 9090, 9091, etc.

If you see something listening on 9001 and it’s a JMX remote agent, it means some Java process started with system properties like:

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=9001
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false

This opens JMX on port 9001 without authentication/SSL (often only for internal or dev use, since it’s insecure if exposed publicly).

How to check which program uses JMX port 9001 on Windows

Open Command Prompt (as Administrator).
Run:
```
netstat -ano | findstr :9001
```
This shows the PID (Process ID) bound to that port.
To identify the program:
```
tasklist /FI "PID eq <PID>"
```
Replace <PID> with the number from step 2.

How to stop / kill it

If you confirm it’s a Java process you don’t want, kill it with:
```
taskkill /PID <PID> /F
```
But if it’s part of your application server (Tomcat, WebSphere, Spring Boot app, etc.), better to stop it via its service/console instead of killing the process, so it shuts down cleanly.

👉 Do you want me to also show you how to disable JMX remote agent in a Java application so it doesn’t open port 9001 at all?

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