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Dropping that firewall: CentOS & RedHat! 
When you are working on your own cluster - behind your own firewall - then having ANY type of port-security on an on-demand server is just plain 'ol annoying.

Here is how to allow access to ALL of those ports on your R&D server. -Wherever iptables is 'empestered:

service iptables save
service iptables stop
chkconfig iptables off
service iptables restart

Now Tomcat, 8080, 80, and (etc, etc,) will respond as most software developers are used to.

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p.s: Ubuntu Tomcat users can do this.


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