PHP y RSS

[Papeluis]

Hola:
Tengo un blog wordpress en mi sitio web, lo que quiero es poner los titulares del blog en mi página de index.php con RSS, hasta hoy lo hago a través de un scripts, pero se vuelve un poco lento el proceso, pues bien, trabajo con Dreamweaver y su extension RSS.

Al momento de probar conectarme (desde mi localhost) al rss que genera mi blog (http://www.muestrate.cl/blog/?feed=rss2) se ve perfecto.

Si subo a internet la página ésta me dice que no puede conectarse a la url del RSS del blog. Este es el mensaje:
http://www.muestrate.cl/blog/?feed=rss2 could not be opened

No he encontrado casos parecidos en google, ¿alguien sabe que sucede?

Este es el código php de la conexión.

<?php
$itemNum=0;
class RSSParser {
var $channel_title="";
var $channel_website="";
var $channel_description="";
var $channel_pubDate="";
var $channel_lastUpdated="";
var $channel_copyright="";
var $title="";
var $link="";
var $description="";
var $pubDate="";
var $author="";
var $url="";
var $width="";
var $height="";
var $inside_tag=false;
function RSSParser($file) {
$this->xml_parser = xml_parser_create();
xml_set_object( $this->xml_parser, $this );
xml_set_element_handler( $this->xml_parser, "startElement", "endElement" );
xml_set_character_data_handler( $this->xml_parser, "characterData" );
$fp = @fopen("$file","r") or die( "$file could not be opened" );
while ($data = fread($fp, 4096)){xml_parse( $this->xml_parser, $data, feof($fp)) or die( "XML error");}
fclose($fp);
xml_parser_free( $this->xml_parser );
}

function startElement($parser,$tag,$attributes=''){
$this->current_tag=$tag;
if($this->current_tag=="ITEM" || $this->current_tag=="IMAGE"){
$this->inside_tag=true;
$this->description="";
$this->link="";
$this->title="";
$this->pubDate="";
}
}

function endElement($parser, $tag){
switch($tag){
case "ITEM":
$this->titles[]=trim($this->title);
$this->links[]=trim($this->link);
$this->descriptions[]=trim($this->description);
$this->pubDates[]=trim($this->pubDate);
$this->authors[]=trim($this->author);
$this->author=""; $this->inside_tag=false;
break;
case "IMAGE":
$this->channel_image="<img src=\"".trim($this->url)."\" width=\"".trim($this->width)."\" height=\"".trim($this->height)."\" alt=\"".trim($this->title)."\" border=\"0\" title=\"".trim($this->title)."\" />";
$this->title=""; $this->inside_tag=false;
default:
break;
}
}

function characterData($parser,$data){
if($this->inside_tag){
switch($this->current_tag){
case "TITLE":
$this->title.=$data; break;
case "DESCRIPTION":
$this->description.=$data; break;
case "LINK":
$this->link.=$data; break;
case "URL":
$this->url.=$data; break;
case "WIDTH":
$this->width.=$data; break;
case "HEIGHT":
$this->height.=$data; break;
case "PUBDATE":
$this->pubDate.=$data; break;
case "AUTHOR":
$this->author.=$data; break;
default: break;
}//end switch
}else{
switch($this->current_tag){
case "DESCRIPTION":
$this->channel_description.=$data; break;
case "TITLE":
$this->channel_title.=$data; break;
case "LINK":
$this->channel_website.=$data; break;
case "COPYRIGHT":
$this->channel_copyright.=$data; break;
case "PUBDATE":
$this->channel_pubDate.=$data; break;
case "LASTBUILDDATE":
$this->channel_lastUpdated.=$data; break;
default:
break;
}
}
}
}

$blog = new RSSParser("http://www.muestrate.cl/blog/?feed=rss2");
?>