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How to connect to JMX server running inside WSL2 – Nginx

I’m running my Java application with the following parameters that enable JMX server’s remote connections:

-Dcom.sun.management.jmxremote=true
-Dcom.sun.management.jmxremote.port=9998
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false

I can successfully connect to that JMX server via VisualVM by adding a new JMX Connection to address: <HOSTNAME>:9998

But when i run that application inside Windows Subsystem for Linux 2 (WSL2) Visual VM cannot connect to localhost:9998:
connection failed

For what I know, every port that the application is listening on in WSL2 is also opened in host machine (Windows itself), and I can check that using Win+R -> cmd -> telnet localhost 9998 (connected successfully).
Also, I’m running an nginx instance inside WSL2 that I can connect to by any browser on my host machine (Windows) using localhost.

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4

Answers


  1. 0

    This seems to be a general issue with Java.

    https://github.com/microsoft/WSL/discussions/6253

    A workaround that worked for me was listening on ‘0.0.0.0’ instead of ‘127.0.0.1’ in WSL2 with the JMX server.

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  2. 0

    I wasn’t able to get Windows jconsole to connect to a JVM running in WSL2 using any of the suggestions above, however it is now possible to run Linux jconsole in WSL2, using Windows 11’s Linux GUI support. Works perfectly.

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  3. 0

    I had the same problem and finally I found a working set of properties for my WSL2. Additionally I had additional requirement to set it up for docker container running inside WSL2, while JConsole/VisualVM was running on Windows host. I have also a VPN running which probably mess up networking even more.

    I found this application https://github.com/cluther/jmx-tester to be useful in debugging the connection.

    inside WSL2

    java 
-Dcom.sun.management.jmxremote=true 
-Djava.rmi.server.hostname=127.0.0.1 
-Dcom.sun.management.jmxremote.port=9991 
-Dcom.sun.management.jmxremote.ssl=false 
-Dcom.sun.management.jmxremote.registry.ssl=false 
-Dcom.sun.management.jmxremote.authenticate=false 
-Djava.net.preferIPv4Stack=true 
-jar jmx-tester-1.0.0.jar

    Then on Windows host connect JMX to 127.0.0.1:9991

    docker container inside WSL2

    java 
-Dcom.sun.management.jmxremote=true 
-Djava.rmi.server.hostname=127.0.0.1 
-Dcom.sun.management.jmxremote.host=0.0.0.0 
-Dcom.sun.management.jmxremote.port=9991 
-Dcom.sun.management.jmxremote.rmi.port=9991 
-Dcom.sun.management.jmxremote.ssl=false 
-Dcom.sun.management.jmxremote.registry.ssl=false 
-Dcom.sun.management.jmxremote.authenticate=false 
-Djava.net.preferIPv4Stack=true 
-jar jmx-tester-1.0.0.jar

    Then on Windows host connect JMX to 127.0.0.1:9991

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  4. 0

    In my case it depends on java.net.preferIPv6Addresses https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/net/doc-files/net-properties.html

    Default value is false

    I have server running on WSL2 and client running on Win11:

    c:>java -Djava.net.preferIPv6Addresses=system my.My2 http://localhost:8025
http://localhost:8025
{"timestamp":"2022-04-22T10:25:03.819+00:00","status":"404","error":"Not Found","path":"/"}

c:>java -Djava.net.preferIPv6Addresses=true my.My2 http://localhost:8025
http://localhost:8025
{"timestamp":"2022-04-22T10:25:14.544+00:00","status":"404","error":"Not Found","path":"/"}

c:>java -Djava.net.preferIPv6Addresses=false my.My2 http://localhost:8025
http://localhost:8025
Exception in thread "main" java.net.ConnectException
        at java.net.http/jdk.internal.net.http.HttpClientImpl.send(HttpClientImpl.java:571)
        at java.net.http/jdk.internal.net.http.HttpClientFacade.send(HttpClientFacade.java:123)
        at my.My2.main(My2.java:15)
Caused by: java.net.ConnectException
...

c:>java  my.My2 http://localhost:8025
http://localhost:8025
Exception in thread "main" java.net.ConnectException
        at java.net.http/jdk.internal.net.http.HttpClientImpl.send(HttpClientImpl.java:571)
        at java.net.http/jdk.internal.net.http.HttpClientFacade.send(HttpClientFacade.java:123)
        at my.My2.main(My2.java:15)
Caused by: java.net.ConnectException
...
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