WHMCS Integration: Too many redirects.

Hello, when I attempt a test order on my site and try add a domain to a hosting package I receive "WHMCS Integration: Too many redirects.". Having checked the support forum already I have touched ensured I am using the portal template, my URLs are correct and I have touched wp-includes/class-http.php.

Any ideas?

Thanks
Jamie

http://www.jacent.net/gateway/