matswiderski opened a new issue, #6226:
URL: https://github.com/apache/jmeter/issues/6226

   ### The documentation URL
   
   https://jmeter.apache.org/usermanual/remote-test.html#tips
   
   ### Feedback
   
   The documentation says:
   These ports can be controlled by jmeter property called client.rmi.localport 
in jmeter.properties.
   If this is non-zero, it will be used as the base for local port numbers for 
the client engine. At the moment **JMeter will open up to three ports beginning 
with the port defined in client.rmi.localport**.
   
   And instruction in jmeter.properties file says:
   If you specify a base port, JMeter will (at the moment) use the **ports that 
start one after the given base**.
   You may need to open Firewall port on the Controller machine
   client.rmi.localport=0
   
   Let's say I set the client.rmi.localport to 20012, then according to the 
instruction the port that should be correct is 20013. Unfortunately, it is not. 
After running the tests and checking the ports in Resource Monitor, it turned 
out that Java uses ports 20013 and 20014. So it seems to me that it is rather 
as written in the documentation.
   
   I also have questions: 
   - is there any reason why JMeter reserves three ports?
   - why were there two ports in my case (without port 20012)?


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