
New info that I just discovered is that when I try to configure mail profile via control panel > mail - I am unsuccessful. Also we use proxy to connect to Internet.

Also I noticed that Skype for business also do not want to access calendar data from Outlook andĬontinuously ask for credentials. Also I tried to enable Single sign-on and the problem persist. Synchronization is configured and if channel will die users still will be able to authenticate. I do not want to enable pass through authentication since when Internet channel to our AD will die nobody will be able to authenticate. I enabled Modern Authentication, it was disabled before, but the problem persist. Outlook 2016 do not need any registry keys configured to work with modern authentication. Provided me with registry key for Outlook 2013 and in topic description I clearly say that I work with Outlook 2016. The cause of this later problem was modern authentication, that RhoderickĪfter I disabled modern authentication both Outlook 2016 and Outlook 2013 authenticate successfully.

Show empty white window or white window with something like "Can not connect.

The first problem was that our proxy server denied access to following addresses:Ī.com:443Īfter we allowed access to these addresses we run into another problem - Outlook 2013 authenticate successfully, but Outlook 2016 fail to authenticate.
