Connection was reset to mws.amazonservices.com API

I was trying to use this example to get a product information by applying these steps, but seems there is a problem with the connection because I've got Recv failure: Connection was reset when I make the connection.

Here is the connection details with same code of the example:

$protocol = "http";
$method = "POST";
$host = "mws.amazonservices.com";
$uri = "/schema/Products/2011-10-01";
$base_url = $protocol."://".$host.$uri;

Are there some of upadates to the API? I could make the connection to http://ift.tt/1f5d9Nk and everything is OK.

Thanks.