1) LWP::Parallel::UserAgent::_check_bandwith: (LWP::Parallel::UserAgen
+t::Entry=HASH(0xe0f768) [http://www.cnn.com] )
2) LWP::Parallel::UserAgent::on_connect: (http://www.cnn.com)
3) LWP::Parallel::UserAgent::_connect: (LWP::Parallel::UserAgent::Entr
+y=HASH(0xe0f768) [http://www.cnn.com] )
4) LWP::Parallel::UserAgent::init_request: -> (HTTP::Request=HASH(0xa0
+c23c)) [GET http://www.cnn.com]
5) LWP::Parallel::UserAgent::init_request: GET http://www.cnn.com
6) LWP::UserAgent::_need_proxy: Not proxied
7) LWP::Parallel::UserAgent::on_failure: (http://www.cnn.com)
8) LWP::Parallel::UserAgent::_check_bandwith: Failed connection for 'w
+ww.cnn.com:80
'


# this method checks the available bandwith and either connects
# the request and returns 1, or, in case we didn't have enough
# bandwith, returns undef
sub _check_bandwith {
    my ( $self, $entry ) = @_;
#1  LWP::Debug::trace("($entry [".$entry->request->url."] )");
.....
    } elsif ( $self->_hosts_available ) {
#2    $self->on_connect ( $request, $response, $entry );
#3    unless ( $self->_connect ( $entry ) ) {
        # only increase connection count if _connect doesn't return er
+ror
        $self->{'current_connections'}->{$netloc}++;
    } else {
        # calling ->on_failure is done within ->_connect
#8        LWP::Debug::debug ("Failed connection for '" . $netloc ."'")
+;
        $self->{'failed_connections'}->{$netloc}++;
.....
}


sub _connect {
    my ($self, $entry) = @_;
#3  LWP::Debug::trace("($entry [".$entry->request->url."] )");
    local($SIG{"__DIE__"});    # protect against user defined die hand
+lers
  
    my ( $request, $response ) = $entry->get( qw(request response) );
  
    my ($error_response, $proxy, $protocol, $timeout, $use_eval, $nonb
+lock) = 
#4       $self->init_request ($request);

    if ($error_response) {
        # we need to manually set code and message of $response as wel
+l, so
        # that we have the correct information in our $entry as well
        $response->code ($error_response->code);
        $response->message ($error_response->message);
#7      $self->on_failure ($request, $error_response, $entry);
        return $error_response;
     }
[download]

I suggest this patch for a start so you can read the error message:

    } elsif ( $self->_hosts_available ) {
        $self->on_connect ( $request, $response, $entry );
        my $err_msg = $self->_connect ( $entry );
        unless ( $err_msg ) {
            # only increase connection count if _connect doesn't retur
+n error
            $self->{'current_connections'}->{$netloc}++;
        } else {
            # calling ->on_failure is done within ->_connect
            LWP::Debug::debug ("Failed connection for '" . $netloc ."'
+\nError: $err_msg");
            $self->{'failed_connections'}->{$netloc}++;
[download]