Hello,
It does not effect the redirect. You are getting that error because, you are pointing your redirect to the wrong URL. You do not own gamingredirect.net and everything is explained in the welcome email your friend received when his account was setup. You are to point your redirect to the following inside your servers config file:
http://www.gamingredirect.net/5644792756/
The following is an example that shows your redirect is working properly as it will prompt you to download the file:
http://www.gamingredirect.net/5644792756/AK47.u
Please understand as well that redirect directory viewing is turned off, any alteration of this will be subject to suspension. Pointing your browser to your root folder will still prompt a 403 Forbidden, again, this does not effect your redirect in anyway.
Regards,
Gaming Redirect Team
http://www.gamingredirect.com