Using ARR 2.5 with Sitefinity for Reverse Proxy

Is anyone using ARR 2.5 with Sitefinity as a front end reverse proxy? We have multiple web application servers, Sitefinity being just one of them, that sit behind an Microsoft Application Request Routing 2.5 proxy server. The ARR server handles requests for all of our servers and routes the request to the correct server. (It also caches pages marked for caching which is nice)

The configuration is simple, if the URL hasn't been specifically marked for another application server, Sitefinity is the catch all.

However, I am having trouble with the /sitefinity/ backend folder. When I try to get to that folder via the proxy I receive the following message from Google Chrome,

"The webpage at oursite.com/.../Login has resulted in too many redirects".

Any ideas?
Dan Sorensen