I have a lync 2013 server. When anyone sends a lync meeting to someone not on our network, they get prompted for windows credentials (we are using the Lync Meeting plugin in outlook to send the invite).
In the Lync Server Control Panel, under security, I have the web service set to "negotiate". If I choose anything else, ("integrated windows authentication" or "None") then no one can use the Lync app on their smartphone. If I choose "None", the pop up asking for credentials goes away but we still cannot log in on the phone app.
any thoughts on where to look for answers on this one?
Thanks,
Jason