Great tool to test OnPremise deployments
A fairly recent announcement was that the Lync Connectivity Analyzer tool has been retired noted below and in a blog post from Microsoft here
https://1drv.ms/f/s!AvBNRjYUuhsvjbtI7W-J2JRe7MtaPw
Ive added the documentation from TechNet below just in case it disappears as well
https://technet.microsoft.com/en-us/library/jj907302(v=ocs.15).aspx
NextHop Blog Post on it as well here
https://blogs.technet.microsoft.com/nexthop/2013/02/05/the-new-lync-connectivity-analyzer/
Using Lync Connectivity Analyzer in Lync Server 2013
Lync Server 2013
Topic Last Modified: 2014-02-11
Microsoft Lync Connectivity Analyzer helps Lync administrators determine whether the deployment and configuration of their Office 365 or on-premises Lync Server environment meets the requirements to support connections from Lync Windows Store app and Lync apps on mobile devices.
Lync Connectivity Analyzer attempts to connect to Lync Server on-premises or Lync Online by using the same services and protocols that are used by Lync Windows Store app and Lync mobile apps. You can perform the connection tests over your internal network or over an external network…
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