We have one core server on 2016 which I'm trying to get up and running to replace our old box.
When I try to do HII, it tells me I need to configure a preferred server first - fair enough.
If I go to preferred servers, I can put in the credentials of a new user I created and click on test - if I try to test UNC I get 'UNC authentication failed'.
I tried adding the new user I created to the \\servername\packages$ folder permissions but it made no difference.
SO... the question is, when it says UNC authentication failed, what is it trying to authenticate TO?
All the docs I can find just say 'put in credentials and click test' but nothing about giving those credentials any permissions.