Lync 2013 desktop sharing is giving Black screen when using virtual machine

Hello,
We have a user who is connecting our network through VPN and connecting to a virtual machine. He is able to login to lync but when he start desktop sharing or some one sharing the desktop to him, he is getting black screen. He is using windows 7 and Lync
2013 client. Please advice

Hi,
Did he receive any error message?
Please double check the ports for VPN traffic.
Please also enable logging on Lync client for further troubleshooting.
What’s more, when users connect to the corporate network using a VPN client, Lync media traffic is sent through the VPN tunnel. This configuration can create additional latency and jitter because media traffic must pass through an additional layer of encryption
and decryption. The issue is compounded when the VPN concentrator is busy.
You can configuration like this:
Lync client connect to the Access Edge Server for all signaling connections when on the corporate VPN. However, Media sessions routed through the A/V Edge Server interface instead of establishing connectivity through the VPN tunnel.
More details:
http://blogs.technet.com/b/nexthop/archive/2011/11/15/enabling-lync-media-to-bypass-a-vpn-tunnel.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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Everything works fine when I'm in control with other person's desktop, however when the Lync IM/Sharing window looses focus and then the focus is regained by clicking on the shared desktop, all the input is frozen in the Lync IM window.
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Hi Bartek,
Did the issue happen on Windows 7/8 32 bit using Lync 2013 32 bit?
Try Clean Boot to disable all non-Microsoft services and start Lync again:
How to Clean Boot:
http://support.microsoft.com/kb/929135
Since the OS is 64 bit, please remove Lync 2013 32 bit and install Lync 2013 client 64 bit and apply the latest update then test the issue again.
Best Regards,
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this is Lync 2013.
When desktop sharing between 2 external users( Connecting from Internet) will it be P2P or will it go via FE servers ?
When desktop sharing between 1 internal user and 1 External user, will it be via FE server ?
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Sorry about that, I guessed this was common knowledge.
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Lync 2013 desktop sharing is giving Black screen when using virtual machine

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