If your concern users has access or authorized so I believe you are missing domain name while entering the credentials as, MAC follows form based authentication, so you may add your user id as DomainName\user id then credentials.
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I have same problem, works perfectly fine with Windows computers. But not with mac.
All users are locally on the server and when we are trying to logon with the Form it says :
The following user is not authenticated
and if we login with windows authentication on Mac it promt us to put in user and pw, and then the browser is all white and goes no further. We tried 3 diffrent browsers and still same result.
We have tried with ./ and domain name on the form.
tried to change the security rules on the server, nothing works.
The QlikSense Server is version 3.2
Please install Qlik June 2017, its latest release. Second if you can login with windows but not MAC even if you are using domain name, its strange. Try one things, go to QMC= Virtual Proxies => select central => windows authentication pattern => remove windows and write "FORMS" and the try with MAC