Puppet users - Nov 2014 - configure puppet master and puppet agent

Hi, im very new using linux and I need to make connection between puppet 
master and puppet agent. I already success to make httpd port 8140 listen 
after that I continues to make a connection between puppet master and agent 
but failed. I cant send request from agent to master. Can someone here help 
me? Im using CentOS 5. I already attach the documentation that I followed. 
Thanks

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