Open Source Document Management System | OpenKM

Can you tell me how to fins what firewall I have in debian linux? I want to install a new firewall or to open some ports on this one.. but i don't know where I can find and uninstall or install it.. can u help me ?
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market samurai ~ marketsamurai ~ marketsamurai.com

This forum is dedicated to OpenKM, not is the best place to get help on Debian administration.