I have a SharePoint 2013 instance that runs our company intranet site. This past weekend we moved our site to a new set of servers and we also set the site up use SSL (https). Since this move, some, but not the majority users are being asked for user credentials when the site comes up. We have spent 2 days trying to figure this out and this is what we have determined:
Users can hit cancel or the x to close the credentials window, and the site loads fine. This only happens for about 30% of all the users. I am one of those users and I am Site Collection Admin and Farm Admin. Once the user dismisses the credentials window, the user isn't prompted again during his/her current session. I have found that if I sit on a certain page on the site and return the home page (say after 15 minutes or so), that I will get prompted again. It appears as if this issue only relates to the home page. We have applied the recommended fixes for the Loopback check issue as describe here The home page does have a Page Viewer control that has a URL path that points to a SQL Server Report server. Both are part of the same domain. (Intranet site url is https://intranet.mycompany.com and the report server is https://[servername].mycompany.com) We're looking for any information that could help us figure out why this is happening or where to look, as we have exhausted most options.