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Centos 4.4 and blocked ports but no firewall?



I have had CentOS running on my desktop for quite some time (several 
months) with no firewall or other security enhancements.   I just set up a 
service on a special port, but port scanning from other machines on the 
lan (machines that have no firewall either) cannot the port on the centos 
box.

I am able to telnet into localhost <special port>, but a telnet of <local 
ip> <special port> from lan boxen say connection refused.

I have a simple linksys box that is not blocking anything internally.

I specifically disabled all port filtering on the centos box to keep it as 
open as possible.

What am I missing?

Thanks.

Scott

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