I have two problems, but the second problem started when I tried to integrate an office web apps server with exchange 2013 so I am putting them into one post.
I have two Windows Server 2012 boxes, one with Exchange 2013 (both roles) one with only Office Web Apps Server 2013. Exchange 2013 was working perfectly internally and externally.
First issue - When I try and preview a document, I get the message "The WebReady Document Viewing service has been disabled by the administration for your organization. For more information, contact your helpdesk"."
I am not using https for this test setup (AllowHttp is True), and the http.../hosting/discovery URL works fine both internally and externally. I followed this guide to integrate Exchange with my Office WA server:
http://technet.microsoft.com/library/2591b1be-92c4-4192-9f5e-e4e6b319170a
Second issue - if I access Exchange OWA on the internal URL http://server/owa, when I click on a message the right pane says in red text "Your request can't be completed right now. Please try again later.
If I access the external URL (even from an internal computer, where DNS is setup to resolve to the internal IP address of the exchange CAS), everything works fine (except for the Webready Document viewing)
This second issue only started occurring when I tried to integrate office web apps, but even If I remove the WACDiscoveryEndPoint from the exchange OrganizationConfig the problem persists.
Any help appreciated.
Blair