Infinite SEO sitemap 403 in Google webmaster tools

I did not see anything like this when i searched but when I submit the sitemap created by Infinite SEO to webmaster tools I get:

General HTTP error: HTTP 403 error (Forbidden)
HTTP Error: 403

However I can pull up the XML just fine,
http://superiorbenefitsinc.com/sitemap.xml. Could the problem be in the domain mapping?
Thanks
Ty