docs/en-US/enable-security-groups.xml

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<section id="enable-security-groups">
	<title>Enabling Security Groups</title>
	<para>In order for security groups to function in a zone, the security groups feature must first be
        enabled for the zone. The administrator can do this when creating a new zone, by selecting a
        network offering that includes security groups. The procedure is described in Basic Zone
        Configuration in the Advanced Installation Guide. The administrator can not enable security
        groups for an existing zone, only when creating a new zone.</para>
</section>