Office web apps for sharepoint and lync 2013 and external firewall

We currently have lync server without web apps and we also have a project to setup sharepoint that will need to work with office web apps. To save on windows licenses we've decided to use same office web apps server that we are setting up for both sharepoint and lync. I'm not so sure if this is doable and if it is, how can I set it up, what do i need to open on the firewall, and what's the DNS requirement?
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Rainer JeschorCommented:
which SharePoint, Office Web Apps and Lync version (version and edition)?
If its version 2013, you cannot install Office Web Apps AND SharePoint on the same machine. OWA needs to be installed on a dedicated server.
But it should be possible to use OWA Server from both Lync and SharePoint - please see
If it is a single OWA server, only port 80 and 443 has to be opened in the firewall.


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SuperRootAuthor Commented:
Thanks for your help! I do have sharepoint and lync 2013. I also setup a server just for Office web apps. Most of our clients don't have lync on their computers so I'm setting up the lync web app.

I'm unsure how IE(or lync) calls office web app from Microsoft Lync web app gui. Is there a dedicated external DNS for office web app and how will lync know there's an external web app? My Office web app currently have internal ssl cert, I'm not sure how will it respond if I have a different DNS name for external? I don't want to just open the port if I'm unsure what my next steps are :(

So far, when I ran Lync web app from IE or chrome and view a test powerpoint, I see the office web app stuck in loading view.
SuperRootAuthor Commented:
is there even a way to setup a different ssl certificate for internal and external? We have a strict policy for using certificate and want to make sure internal is different from external.
SuperRootAuthor Commented:
I solved my own issue
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