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I'm using a dedicated host. Unfortunately, when I use x windows with xming, it tends to freeze up the x windows session. This is keeping me from calling system-config-securitylevel and making changes to the firewall. Is there a way to do it on the command line?

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Yes, it is called iptables.

The CentOS wiki has written a nice piece together about it:

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@nikhil Indeed. Read, Learn, and Inwardly Digest NetFilter/IPTables. If you're admin'ing CentOS boxen, you need to understand how they're secured and this is an important part. – Magellan Mar 18 '12 at 6:03

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