Different number is OK, I tested on a misconfigured moodle.
When I test with the real one, I also get the 713 error.
So, the URL is OK because you get the XML file, so I don't know what can be happening.
I am thinking that this must be Windows-related, as I checked by old mail and found this problem happening to two Windows users.
One thin I never looked is that you have activated allow_url_fopen in PHP. Check your php info to confirm.
As I told you I don't use Windows, so I can't replicate your setup, but I am very interested in making this work in Windows, so if that does not help, we will continue trying
Antonio