CSF error : No response from subprocess (/usr/local/cpanel/whostmgr/docroot/cgi/addon_csf.cgi): subprocess exited with status 2

On checking the Cpanel error log at /usr/local/cpanel/logs/error_log, you can see the errors as :

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Can't locate Net/LibIDN.pm in @INC (@INC contains: /usr/local/cpanel /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib/perl5/5.8.8/i386-linux-thread-multi /usr/lib/perl5/5.8.8 .) at /usr/local/cpanel/Cpanel/Encoder/Punycode.pm line 10.
Compilation failed in require at /usr/local/cpanel/Cpanel/DomainTools.pm line 13.
BEGIN failed--compilation aborted at /usr/local/cpanel/Cpanel/DomainTools.pm line 13.
Compilation failed in require at /usr/local/cpanel/Cpanel/CheckData.pm line 8.
BEGIN failed--compilation aborted at /usr/local/cpanel/Cpanel/CheckData.pm line 8.
Compilation failed in require at /usr/local/cpanel/Cpanel/cPanelFunctions.pm line 11.
BEGIN failed--compilation aborted at /usr/local/cpanel/Cpanel/cPanelFunctions.pm line 11.
Compilation failed in require at /usr/local/cpanel/whostmgr/docroot/cgi/addon_csf.cgi line 24.
BEGIN failed--compilation aborted at /usr/local/cpanel/whostmgr/docroot/cgi/addon_csf.cgi line 24.
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Inorder to fix this issue run the following command :

curl -s configserver.com/free/csupdate | perl

This script will update: cmm, cmc, cmq, cse, csf, cxs, msinstall, msfe
Only those scripts that are already installed will be updated. Those that are updated are done so regardless as to whether they are the same or an older version of those available.