SEO Check says: Your server appears to allow access from User-agent Libwww-perl.

Your server appears to allow access from User-agent Libwww-perl. Botnet scripts that
automatically look for vulnerabilities in your software are sometimes identified as User-
Agent libwww-perl. By blocking access from libwww-perl you can eliminate many simpler
attacks. Read more on blocking Libwww-perl access and improving your website's
security.
HOW TO FIX LIBWWW-PERL ACCESS TEST
In order to pass this test you must block the libwww-perl user-agent in your .htaccess
file.
If your site is running on apache server, you could put these lines in your .htaccess after
RewriteEngine on line:
RewriteCond %{HTTP_USER_AGENT} libwww-perl.*
RewriteRule .* ? [F,L]