500 Can\'t connect to xml.reuniontelecom.com:80 (Bad hostname \'xml.reuniontelecom.com\')

HI all,

I m running the following script on the red ha linux in perl.

use strict;
use Data::Dumper;
use LWP::UserAgent;
use HTTP::Request;
use HTTP::Headers;
use LWP::Debug qw(+);
my $method = 'POST';

my $uri = 'http://xml.reuniontelecom.com/';
#my $uri = 'http://www.google.com';
## This is the fake request we are generating
my $xmlRequest = '<?xml version="1.0" encoding="UTF-8"?><Request><NXX>882</NXX><ClientID>2070</ClientID><NPA>561</NPA></Request>';

my $MIME_Version = '1.1';            
my  $content_type = 'text/xml';          
my  $content_length = length($xmlRequest);                    
my $content_transfer_encoding = 'text/xml';
my $document_type = 'Request';

my $header = HTTP::Headers->new;
$header->header (                  
                  'Content-Type'  => $content_type,            
                  );      

my $HTTP_req = HTTP::Request->new($method,$uri) ;
my $UserAgent = LWP::UserAgent->new();
my $host_response = $UserAgent->get($uri);

unless($host_response->is_success)
            {
            print STDERR "\n                     I M GETING ERRORS        " x 10 ;
            }
      
my $response_content = $host_response->content;
my @lines = split('\n',$response_content);
my $ending_value = scalar(@lines);      

print STDERR "\n=========   response  content  ========  \n" . Dumper($response_content);
__END__

But I m getting the error as 500 Can\'t connect to xml.reuniontelecom.com:80 (Bad hostname \'xml.reuniontelecom.com\')

I m unable to find where should investigate to get the proper response or elsewhat I m missing in the setting of my machine.

Kindly provoide the solutions.
Regards.