I have recently deployed a Lync 2013 FE and an edge server. Lync is working great, except when my users go to present a PowerPoint. Of course, this is driven by connectivity with an Office Web Apps server. I happen to have one already in production that serves my Sharepoint 2013 farm. I have defined it in the Lync topology, enabled all TCP/IP traffic between the FE and the WAP server, and have verified that i can successfully open the WAP discovery page from my Lync FE.
When my users go to open PowerPoints in Lync, they get the error mentioned in this post. http://www.ucguys.com/2013/04/office-web-apps-running-on-server-2012-cant-upload-powerpoint-from-lync-client.html
I don't see any event logs regarding WAP or Office connectivity. I've tried a reboot of both servers. All prerequisites, including .NET, are present. My Lync FE is running Server 2012 R2 and my WAP server is running Server 2012.