$ua = WWW::Mechanize->new(
      ssl_opts => {
          SSL_ca_path     => '/etc/ssl/file-with-company-certificates',
          verify_hostname => 1,
      }
  );

##</code><code>##

<p>Maybe the following works:</p>
<c>
 $ua = WWW::Mechanize->new(
      ssl_opts => {
          verify_hostname => 0,
      }
  );