PHP: function.fopen : failed to open stream

Si en php al intentar utilizar fopen obtienen un resultado como:

Download Failed: Remote Server connection failed: fopen(http://jsitepoint.com/update/packages/joomla/update.xml) [function.fopen]: failed to open stream: no suitable wrapper could be found; Using Proxy: No(42)

La solución es editar php.ini modificando/agregando:

; Whether to allow the treatment of URLs (like http:// or ftp://) as files.
; http://php.net/allow-url-fopen
allow_url_fopen = On

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