Find and Kill JMX Port Process

Find and Kill JMX Port Process | Generated by AI

Home 2025.09

Got it — you want to check which Java program on Windows has opened a JMX remote agent on port 9091, and then kill it if necessary. Here’s how you can do it step by step:

1. Find the Process Using Port 9091

Open Command Prompt (as Administrator if possible), and run:

netstat -ano | findstr :9091

This shows something like:

  TCP    0.0.0.0:9091    0.0.0.0:0    LISTENING    12345

The last column (12345 here) is the PID (Process ID).

2. Identify Which Program That PID Belongs To

Now map the PID to the actual program:

tasklist /FI "PID eq 12345"

This will show something like:

Image Name                     PID   Session Name        Mem Usage
========================= ======== ================ ============
java.exe                    12345 Console           200,000 K

If it’s a Java process, you can get even more detail:

wmic process where processid=12345 get CommandLine

That prints the command line used to launch the JVM — you’ll see the JMX flags (-Dcom.sun.management.jmxremote.port=9091), which confirms it’s the JMX remote agent.

3. Kill the Process

If you’ve confirmed it’s safe to stop, you can kill it:

taskkill /PID 12345 /F

/PID specifies the process ID.
/F forces termination.

4. Alternative with PowerShell

If you prefer PowerShell, you can run:

Get-Process -Id (Get-NetTCPConnection -LocalPort 9091).OwningProcess

To kill directly:

Stop-Process -Id (Get-NetTCPConnection -LocalPort 9091).OwningProcess -Force

🔎 Summary:

netstat -ano | findstr :9091 → get PID
tasklist /FI "PID eq <PID>" → see which program
wmic process where processid=<PID> get CommandLine → see JVM flags
taskkill /PID <PID> /F → kill

Do you want me to also show you how to check multiple JVMs at once for JMX agent ports (so you can see if others are running on ports like 9090, 9999, etc.)?

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