Re: Lync 2013 VDI plugin only works with RDP protocol

One other thing here - http://technet.microsoft.com/en-us/library/jj204713.aspx

Another instance of the remote desktop client is running.

If they are using Remote Desktop Connection in Windows, users should do the following:

1. Start Task Manager: Press Alt+Ctrl+Delete, and then click Start Task Manager.
2. Click the Processes tab and look for all processes named mstsc.exe in the list.
3. Highlight each mstsc.exe process and then click End Process.
4. Start a new remote desktop session and try connecting again.

I'm wondering if the other RDP session is interfering with the pairing process.