This website send you a cookie
You can use something like that :

my $ua = LWP::UserAgent->new(
        agent      => 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5
+.1; .NET CLR 1.1.4322)',
        cookie_jar => HTTP::Cookies->new( file => 'cookies.txt', 
autosave       => 1,
ignore_discard => 1

 )
    );
[download]

UPDATE
I tested the script and your problem comes from the ASP.NET_SessionId (see below)

#!/usr/bin/perl -w 
use strict;
use LWP::UserAgent;
use LWP::Debug qw(+);

my $ua  = LWP::UserAgent->new();
my $url = q{http://www.investway.com};

my @headers = ( 
    'User-Agent' => 'User-Agent=Mozilla/5.0 (X11; U; Linux x86_64; en-
+US;
  rv:1.8.1.14) Gecko/20080404 Iceweasel/2.0.0.14 (Debian-2.0.0.14-2)',
    'Accept-Language' => 'Accept-Language=en-us,en;q=0.5',
    'Accept-Charset'  => 'Accept-Charset=ISO-8859-1,utf-8;q=0.7,*;q=0.
+7',
    'Accept-Encoding' => 'Accept-Encoding=gzip,deflate',
    'Accept' => "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, 
+image/png,
             */*",
    Cookie => 'ASP.NET_SessionId=l0gfoxzlneisjjfimjng23v1',
);

my $res = $ua->get( $url, @headers );

if ( $res->is_success ) { 
    print $res->headers_as_string, "\n";
}
else {
    print $res->status_line . "\n";

Output:
LWP::UserAgent::new: ()
LWP::UserAgent::request: ()
LWP::UserAgent::send_request: GET http://www.investway.com
LWP::Protocol::http::request: ()
LWP::Protocol::collect: read 552 bytes
LWP::Protocol::collect: read 570 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1368 bytes
LWP::Protocol::collect: read 1028 bytes
LWP::UserAgent::request: Simple response: OK
Cache-Control: private
Date: Tue, 29 Jul 2008 09:34:01 GMT
Server: Microsoft-IIS/6.0
Content-Length: 19934
Content-Type: text/html; charset=utf-8
Client-Date: Tue, 29 Jul 2008 09:33:51 GMT
Client-Peer: 10.154.68.6:8080
Client-Response-Num: 1
Link: <Includes/PropertyDetail.css>; /="/"; rel="stylesheet"; type="te
+xt/css"
Link: <Includes/thickbox.css>; /="/"; media="screen"; rel="stylesheet"
+; type="text/css"
Link: <Images/favicon.ico>; /="/"; rel="shortcut icon"
Title: Investway
X-AspNet-Version: 2.0.50727
X-Powered-By: ASP.NET
[download]

hth,
PooLpi

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