Welcome back to the Centrify forums. As you know, the Identity Platform is updated every month.
Since June, we've been announcing the impending deprecation of Integrated Windows Authentication negotiation over HTTP starting in the 16.10 (october) release. If your users aren't getting SSO, most likely the reason is that you have not updated these settings.
Here are some resources:
@LMcAndrew's post: http://community.centrify.com/t5/Centrify-Identity
or this KB article:
Always remember to opt-in to Centrify communications or read the release notes every month.
Related posts: http://community.centrify.com/t5/Centrify-Express/centrify-authentication-every-day/m-p/24607/highlight/true#M9858
Excerpt from the announcement:
Deprecated Support for IWA over HTTP
As communicated when we upgraded to 16.7, we are officially removing support for IWA over HTTP.
- HTTPS checkbox has been removed, as it’s now the only option
Cloud Connector Configuration from 16.9
Cloud Connector Configuration from 16.10 - HTTPS checkbox removed
R.P