Running Selenium webdriver scripts on selenium Grid

           I am new to testing,now i am working on selenium Grid.

1. I am running my TestNG suite on different browsers and platforms.The framework used is java, TestNG,webdriver,eclipse.


2. Test runs fine while running suite in chrome and firefox on LINUX .I set the environment LINUX system as hub and LINUX systems as nodes.


3. 
   

   Using Selenium Grid when I make the LINUX system the "Hub" and my other Windows machine a "node" The connection is not established/connection timed out and does not match with platform LINUX.

   
   

   How to connect windows System as either node or hub to LINUX system.