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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We actually had to raise a ticket with qlik support. In the end we got it working after we upgraded to the most recent release. I think this bug was only recently fixed - after which it runs perfectly on MACs (even no need for forms authentication)
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
I am currently having the same issues. Using Qlik Sense 2017.
Has anyone discovered a solution?
When trying to connect on Mac I receive error - DNS_PROBE_FINSIHED_NXDomain. I am on the same network as the Qlik Sense Server. When using Remote Desktop from the Mac to any Windows Computer. I am able to connect.