Unable to remotely connect to JMX?

Question

For some weird reason I am not able to connect using VisualVM or jconsole to a JMX.

The parameters used to start the VM to be monitored:

-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=1100

I checked, and I can telnet to this port, from both locally and remotely.

Still, VisualVM or jconsole are failing to connect, after spending some considerably time trying to.

REMOTE MACHINE with JMX (debian) java version "1.6.0_33" Java(TM) SE Runtime Environment (build 1.6.0_33-b03-424-11M3720) Java HotSpot(TM) 64-Bit Server VM (build 20.8-b03-424, mixed mode)  MY WORKSTATION (OS X) java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) 

What is the problem?

Answer 1

Add -Djava.rmi.server.hostname = host ip. Even i faced the same problem and this did the trick.

Addition of this -Djava.rmi.server.hostname = host ip forces RMI service to use the host ip instead of 127.0.0.1

Answer 2

These are the steps that worked for me (Debian behind firewall on the server side was reached over VPN from my local Mac):

1. Check server public ip

   ifconfig

2. Use JVM params:

    -Dcom.sun.management.jmxremote     -Dcom.sun.management.jmxremote.port=[jmx port]     -Dcom.sun.management.jmxremote.local.only=false     -Dcom.sun.management.jmxremote.authenticate=false     -Dcom.sun.management.jmxremote.ssl=false     -Djava.rmi.server.hostname=[server ip from step 1] 

3. Run application

4. Find process ID of the running java process

5. Check all ports used by JMX/RMI

   netstat -lp | grep [pid from step 4]

6. Open all ports from step 5 on the firewall

Voila.