What wordpress platform are you using? Permissions sometimes enter the picture in setting feeds, etc. The business level hosting has much more flexibility than a managed platform, and this what may be is required.
There are several xmlrpc exploits that are well-noted and documented if you google xmlrpc exploit. Some hosting platforms (not just GoDaddy) limit the access to this service unless you are on a VPS or dedicated server. This is for security of others on a shared server.