Lync IIS ARR reverse proxy, 502 - Bad Gateway error

I followed article here to setup IIS Application Request Routing (ARR) 2.5 as a reverse proxy for Lync Server 2013 web services. I am currently unable to connect with Lync 2010 client on Android and "Lync Autodiscover Web Service Remote Connectivity Test" at testexchangeconnectivity.com is failing HTTP authentication test with these details:

A Web exception occurred because an HTTP 502 - BadGateway response was received from Unknown.
Headers received:
Content-Length: 0
Date: Tue, 25 Jun 2013 15:58:51 GMT
Server: Microsoft-IIS/7.5

Any thoughts?
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ByteCafeSupportConnect With a Mentor Author Commented:
Issue resolved. I found that internal CA certificate had not yet been installed on reverse proxy server. After doing this, services came up.
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