ARR as a proxy. How to keep Set-Cookie

Hello,

I have an IIS server 7.5. I am using ARR 2.5 with URL rewrite v2. certain requests are being fwd to an Apache 2.2 server on the same machine (but a different port). The redirects work but I lose my set-cookie response header info. I am trying to figure out how to throw the set-cookie back in the http response for my client.

Thanks in advance,

Jono