Can't authorize jetpack for the json api, and it looks like it's because the wordpress.com end point keeps redirecting back to jetpack in a loop instead of authorizing.
The url is ending up with multiples of all the query strings, for example there are about 6 redirect_uris in there, each urlencoded one more time than the last. It also contains tokens from jetpack so I can tell it's been passed back and forth a few times before it finally gives up with the error:
You must connect your Jetpack plugin to WordPress.com to use this feature.
Jetpack is already connected and is passing stats to wordpress.com with no problems.
I'm on the latest versions of the wordpress installation and jetpack. My initial oauth request to the endpoint follows the developer instructions here and works without problems on a wordpress.com blog. I've tested on two different installed WP sites on different servers with the same error.
The blog I need help with is bigroundhouse.com.