i have a setup with 2 node agents and 1 DAS behind a firewall.
from what i understand, in order for the node agents to communicate with the DAS, a communication channel is created on a random port via JMX.
the problem here is with the random port having to operate over a firewall. Is there any way to assign a fixed port for JMX communication?
I have the same issue. My client has disabled all ports on each of the 2 machines which we have deployed, and only allowing us to enable ports that are essential for App Svr to work.
http://docs.sun.com/app/docs/doc/819-4733/6n6s6u1b6?a=view#ablci
I think you are referring to the above document.
"JMX 8686 Another port is used by the JMX connector to communicate with the DAS."
My thinking is:
1. there is a port ("8686") for connection/establishment purpose for the JMX client to reach the JMX server
2. after initial connection, there is "another port" used for communication purpose
Am I correct? Anyone care to comment?
8686 is the initial communication port for JMX,
do an "grep jmx-connector" on server.xml, you can see 3 ports as a result. Open those ports in your firewall and try.
One will be 8686 which will be for DAS-SERVER
<admin-service system-jmx-connector-name="system" type="das-and-server">
another with variable JMX_SYSTEM_CONNECTOR_PORT, which you can see from admin console. This is for Server
<admin-service system-jmx-connector-name="system" type="server">
another some random port number after nodeagent definition for JMX
<node-agent name="node agent name" start-servers-in-startup="true" system-jmx-connector-name="system">
Regards
Activexpert
