If you’ve noticed the following error message while starting CSF Firewall, it means that you are missing Perl modules on your system in order to fully take advantage of the capabilities of CSF.
*WARNING* URLGET set to use LWP but perl module is not installed, reverting to HTTP::Tiny
In order to install the missing Perl packages/dependencies, use the following command depending of your environment :
Debian/Ubuntu :
apt-get install libwww-perl
RHEL/CentOS
yum install perl-libwww-perl net-tools perl-LWP-Protocol-https