The OP's code didn't work for me either. First I thought, ok, most likely it is a problem at the remote side. It may decide not to respond to unknown agents. So i rewrote the OP's code to the following:

use strict;
use LWP::UserAgent;

my $lwp       = LWP::UserAgent->new( agent => 'Mozilla/5.0' );
my $response  = $lwp->get ("http://kompas.com/kompas-cetak/0505/09/met
+ro/index.htm");

if ( $response->is_error )
{
    print "Error: ", $response->as_string();
}
else
{
    print "Success: ", $response->as_string();
}
[download]

but I get a Error: 500 (Internal Server Error) Can't connect to kompas.com:80 (Bad hostname 'kompas.com').
As far as I understand it, this means the name could not be resolved. I also tried with "http://google.de" with the same outcome.

I am behind a proxy, and I have the environment set correctly.

The strange thing: I have no trouble with ppm.