This file is indexed.

/usr/share/yasat/plugins/firewall.advice is in yasat 526-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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EN,FIREWALL_POLICY_INPUT=Configure your firewall with a drop by default policy
  See <a href="http://www.netfilter.org/">http://www.netfilter.org/</a> for tutorials and howto
ADVICEEND
EN,FIREWALL_POLICY_OUTPUT=Configure your firewall with a drop by default policy
  See <a href="http://www.netfilter.org/">http://www.netfilter.org/</a> for tutorials and howto
ADVICEEND
EN,FIREWALL_POLICY_FORWARD=Unless this machine is a router, DROP forwarding
  See <a href="http://www.netfilter.org/">http://www.netfilter.org/</a> for tutorials and howto
ADVICEEND
EN,FIREWALL_TEST_ERROR=Arggg i can't test your firewall
  Perhaps it's a bug or perhaps you have some security that prevent me to check your firewall.
ADVICEEND
EN,FIREWALL_IPV6_NO_FW=Install ip6tables and configure a firewall
  IPv6 is enabled on this machine, and you don't have a firewall for it.
ADVICEEND
EN,FIREWALL_PF_NOT_ENABLED=Enable PF firewall
  Enable the firewall.
  See <a href="http://www.freebsd.org/doc/en/books/handbook/firewalls-pf.html">http://www.freebsd.org/doc/en/books/handbook/firewalls-pf.html</a>
ADVICEEND
EN,FIREWALL_PF_NO_RULES=TODO
  See <a href="http://www.freebsd.org/doc/en/books/handbook/firewalls-pf.html">http://www.freebsd.org/doc/en/books/handbook/firewalls-pf.html</a>
ADVICEEND