SuperAdmin will not log in on Safari OSX, works on Safari iOS

I am trying to set up multisite for use in the classroom, had bought domain, are going for the subfolder-setup, and just as I came trough the process and wanted to log in as the “SuperAdmin”, I was unable to get “in”.

Fiddling back and forth between Safari on OSX and on iOS, I realized I’m fully able to work as SuperAdmin on the iPad, but on my mac i get redirected to the same log infields with the url https://MySite.no/wp-login.php?redirect_to=http%3A%2F%2FMySite.no%2Fwp-admin%2F&reauth=1

I created a subblog through the iPad, and can easily log in to that, both as the Super and as a regular user, but as soon as I try to touch the network settings, I’m being evicted.

Any suggestions?