#!d:\perl\bin\perl.exe 
use warnings;
use strict;

use CGI qw(:standard);
use CGI::Carp 'fatalsToBrowser';
use LWP;
use HTTP::Request::Common;
use HTTP::Cookies;
use HTTP::Headers;
use LWP::Debug qw(+);
use URI::Escape qw(uri_escape_utf8 uri_escape uri_unescape); 
use Encode;

print "Content-type:text/html;charset=UTF-8\n\n" ;
our $page;
my $jsessionID;
my $viewState;
sub extractLinks(){
$page =~ s/\"\/search(\/.[^ ]+)+\"/https:\/\/patentscope\.wipo\.int\/s
+earch$1\" /g;
}


sub extractJSessionID(){
my $jsessionID="";

if($page =~ /(jsessionid=[A-Z0-9]*\.wapp[0-9]n[A-Z])/si){$jsessionID =
+ $1;}
return $jsessionID;
}

sub extractViewStateID(){
my $ViewState="";
if($page =~ /javax.faces.ViewState:0\" value=\"(-?[0-9:]*)/si){

$ViewState = "javax.faces.ViewState=".$1;}
$ViewState = join( "%3A", split(":", $ViewState) );
return $ViewState;

}
my $proxy = 'http://localhost:5865'; 

my $ua = new LWP::UserAgent(keep_alive => 0, ssl_opts => { verify_host
+name => 0 });    
$ua->proxy(['https', 'http', 'ftp'], $proxy);
$ENV{HTTPS_PROXY} = $proxy;    
$ENV{'PERL_LWP_SSL_CA_PATH'} = "D:\\CA_certs\\input\\certs";    
my $cookie_jar = new HTTP::Cookies();
$ua->cookie_jar($cookie_jar); 
$ua->agent('Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident
+/5.0)');

#download init page for extracting jsession id
my $response = $ua->get("https://patentscope.wipo.int/search/en/search
+.jsf");
die "Couldn't get $url", $response->status_line unless $response->is_s
+uccess;
print $response->status_line;
$page = $response -> decoded_content; 

extractLinks();
$jsessionID = extractJSessionID();
$viewState = extractViewStateID();
print $page;

my $param ='simpleSearchSearchForm=simpleSearchSearchForm&simpleSearch
+SearchForm%3Aj_idt379=ALLTXT&simpleSearchSearchForm%3AfpSearch=brushl
+ess+motor&simpleSearchSearchForm%3AcommandSimpleFPSearch=Search&simpl
+eSearchSearchForm%3Aj_idt447=workaround&$viewState';

#--------- problem part :
my $request = HTTP::Request->new('POST', 'https://patentscope.wipo.int
+/search/en/search.jsf');
$request->header('Content-Type' => 'application/x-www-form-urlencoded'
+);
$request->header('Referer' => "https://patentscope.wipo.int/search/en/
+search.jsf");
$request->header('Accept' => 'text/html,application/xhtml+xml,applicat
+ion/xml;q=0.9,*/*;q=0.8'); 
$request->header('Connection' => 'keep-alive'); 
$request->header('Cookie' => uc $jsessionID.'\; ABIW=balancer.cms41\; 
+wipo_language=en\; BSWA=balancer.bswa2'); 
$request->content($param);

$response = $ua->request($request);
$page = $response->decoded_content();

print $page;
[download]

my $proxy = 'http://localhost:5865';

This line makes me think that we still don't have enough information to help you. What kind of proxy are you running on localhost, and why?

it's from the company, some pages are blocked i guess thats why.