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XCCDF
Guide to the Secure Configuration of Red Hat Enterprise Linux 7
System Settings
Network Configuration and Firewalls
iptables and ip6tables
Strengthen the Default Ruleset
Ensure iptables Firewall Rules Exist for All Open Ports
Ensure iptables Firewall Rules Exist for All Open Ports
An XCCDF Rule
Details
Profiles
Prose
Ensure iptables Firewall Rules Exist for All Open Ports
Medium Severity
Any ports that have been opened on non-loopback addresses need firewall rules to govern traffic.