An Unexpected HTTP Error occurred during the API request

I just did a clean install of WordPress. But I have a problem when I install or use the WordPress API. So send me a sign

An Unexpected HTTP Error occurred during the API request.

The strange thing is that I have looked everywhere. And the solutions do not work for me porponen WordPress 3.2.1 and do not know how to solve the problem

Use the following function to debug the HTTP API request, you will get to know the actual reason why the HTTP API request is failing.

Paste the following code in your theme’s function.php.

function dump_http_response( $response, $type, $transport, $args, $url ) {
    if ( is_admin() && $type == "response" )  {
        echo '<span style="color: #f00;">';
        var_dump( $response );
        echo '</span>';
    }
}
add_action( 'http_api_debug', 'dump_http_response', 1, 5 );