title: Jmeter Perfmon plugin not showing any graph details
body: <p>I have installed the JMeter Perfmon plugin, ensured port 4444 is open on my local host and target machines and started the agent on the target machine. When I start the test I can see the connection from Perfmon is established (no connection errors) but I do not get any graphical display - it just says waiting for samples. I have run longer tests that use a lot of CPU on the target machine but I still do not see any data.
  Is there anything else that should be done aside from ensuring the ports(4444) are open and the server agent is started on the target machine to et the Perfom plugin to generate results (all my other plugins work ok)?</p>