Lync online meeting Firewall help

We do not have Lync in my business but we do have some employees who join online Lync meetings that a customer hosts. The issue we are having is that we can log into the meeting and load the Lync Web App but when the host shares their screen, we get nothing. It just loops. I have made sure to allow the program through the local Windows Firewall ( I even disabled the Firewall in one test and still no go)I setup a meeting with the host today and logged in on my network and on my hot spot. Hot Spot works no problem which leads me to believe it's firewall related. I allowed the ports that I found for Lync Online and still nada. I have a Fortigate Firewall. Has anyone ever allowed Lync through this type of Firewall? I tried adding the applications to a Monitor Sensor and still can't see anything. We are running Win 7 Enterprise with IE 11...
This topic first appeared in the Spiceworks Community

That sounds like either ports blocked or perhaps a routing issue. Of course more details about your architecture are required to make a more accurate assumption. Also, you should be seeing errors in the Front End servers Event Log that could put you on to
the underlying cause.
Lastly, collect a trace using OCSLogger and analyze with Snooper to see why the audio is failing.
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Lync Sorted blog

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Not able view full name of external business partner in Lync online meeting.

Hi
I am not able view full name of external business partner in Lync online meeting.it is showing only First Letter and position title.
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Hi,
Did the issue happen for one partner or for multiple partners?
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Please update to the latest version for Lync server and Lync client and then test again.
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Best Regards,
Eason Huang
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How To Create Lync Online Meeting Using EWS

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The following fix worked in our Exchange 2010, Lync 2010, environment.
Symptom
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Cause
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Why Firefox does not start the Lync online meeting anymore when updated to the version 21.0?

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hello Seppva, please try this: enter '''about:config''' into the firefox address bar (confirm the info message in case it shows up) & search for the preference named '''plugins.load_appdir_plugins'''. double-click it and change its value to '''true''' (a restart of the browser might be necessary afterwards for the change to take effect).
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Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer".
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Hi Socialwebi,
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