(Lync 2013) Lync Web App: Call ended because of network connectivity issues

I'm having a very strange problem with Lync Web App. When I try to join a meeting, it works in the following conditions:
- With the Lync 2013 windows client: always (internal network, external network)
- Lync Web App: Works in internal network. When I'm on an external network, I'm able to join a meeting, but when Lync Web App tries to establish the call, it ends with the error: "Call ended because of network connectivity issues".
On the other hand, IM works with Lync Web App (internal/external network). But all the other features (presentation, audio call, video call) are not working.
Did anyone experience such an issue ?
Thanks,
Antonio

Hi,
Since the issue only happen on Lync web app that was handled by reverse proxy. The issue maybe related to RP configuration. Please refer to one of the following links to check if the RP configuration are correct.
How to Configure ForeFront TMG 2010 as Reverse Proxy for Lync Server 2010
http://social.technet.microsoft.com/wiki/contents/articles/9807.how-to-configure-forefront-tmg-2010-as-reverse-proxy-for-lync-server-2010.aspx
Using IIS ARR as a Reverse Proxy for Lync Server 2013
http://blogs.technet.com/b/nexthop/archive/2013/02/19/using-iis-arr-as-a-reverse-proxy-for-lync-server-2013.aspx
Here is a similar case for your reference:
http://social.technet.microsoft.com/Forums/en-US/lyncconferencing/thread/e5d8d247-4646-4e2a-b6f0-e0fd8b3a5ace
If the issue persists, please try to collect report for further troubleshooting.
http://www.microsoft.com/en-us/download/details.aspx?id=35453
Kent Huang
TechNet Community Support

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