To add a bit more info, I see your site is using a Go Daddy G2 (SHA2) cert. In that case, here is the intermediate/root chain you'll want to use as ssl_trusted_cetificate.

C=US, ST=Arizona, L=Scottsdale, O=GoDaddy.com, Inc., OU=http://certs.godaddy.com/repository/, CN=Go Daddy Secure Certificate Authority - G2
C=US, ST=Arizona, L=Scottsdale, O=GoDaddy.com, Inc., CN=Go Daddy Root Certificate Authority - G2

http://pastebin.com/gnWDSQ8Z

Ryanne