Originally Posted by galaxys4girly
I read somewhere else that you should press the update, which I did of course yet it keeps saying network error or something along those lines
With the update 4.3 this should be fixed.
It looked like Samsung accidentally pushed out the Knox binaries without the management app and the update server being online.
Anyway, if the message keeps coming back, I recommend to disable the Knox service entirely. I did it with Titanium Backup, just freeze any app containing the word "Knox".