At the end of your code its too late. You're supposed to get more info about which Unknown Error it is. Try 

#!/usr/bin/perl --

use strict;
use warnings;

use LWP::UserAgent 5.829;

@ARGV = qw[  http://www.eserve.com.sa/ ];

my $url       = shift or die "URL expected\n";
my $useragent = LWP::UserAgent->new;

$useragent->proxy(['http', 'ftp','https'], 'http://192.168.5.39:8080/'
+);
$useragent -> timeout( 20 );

my $request   = HTTP::Request->new( GET => $url );
my $response  = $useragent->request($request);
my $err =  sprintf "(%d)(%s)(%d)(%s)\n", $!,$!,$^E,$^E;
print $useragent->proxy('http'),"\n";
print "Err : $err\n";
print $response->dump,"\n";

__END__
lwp-request -useUS -m head http://www.eserve.com.sa/
lwp-request -useUS -m get http://www.eserve.com.sa/

[download]
The number of possible unknown errors is huge (goes into 11_000), to see some run 
for my $i( 0 .. 256 ){ # 
    $! = $i;
    $^E = $i;
    printf "(%d)(%s)(%d)(%s)\n", $!,$!,$^E,$^E;
}

[download]
As for these redirected websites, the one in question http://www.eserve.com.sa is HTTP.

Which always redirects to the HTTPs version.

In any case, should I conclude that redirection isn't supported.

No.

In reply to Re^8: LWP for URL monitoring - 500 connect timeout errors by Anonymous Monk
in thread LWP for URL monitoring - 500 connect timeout errors by oalvi

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.