I have installed Exchange 2013 with Mailbox and Client Access Server Role.
For reverse proxy, I have configured Windows 2012 IIS ARR 2.5.
Although I am able to connect Outlook Web App using ARR, none of the other Exchange Web Services work (Autodiscover, OAB, OOF and Outlook Anywhere)
I have configured separate URL's for each of the services as per the TechNet blog article http://blogs.technet.com/b/exchange/archive/2013/08/02/part-2-reverse-proxy-for-exchange-server-2013-using-iis-arr.aspx
If I point my DNS to Exchange 2013 server directly, then everything works.
If I try to open the Autodiscover URL from ARR server https://fqdnofexchange/autodiscover/autodiscover.xml , I get HTTP Error 502.3 - Bad gateway
If I try to open the Autodiscover URL from ARR server https://fqdnofARR/autodiscover/autodiscover.xml , I get page cannot be displayed error.
I have cross checked the URL rewrite rules and they are configured exactly as per the document.