First of all thanks for the replies on this issue. I could only do a reboot/reset by pressing the button in the pinhole (as I was not able to access it via a pc. I had to do this several times and after 4-5 times the unit came back online. After some digging in older posts I found out the just typing the ip address in the browser was the cause. Typing just the ip or only with http caused the same error. But https followed by the defauflt IP did the job. Maybe stupid of me, but I am using Ruckus for more the 6 years and never had this issue. Not in my own office and not at other places, very curious. Allthough it now works I still do think something is wrong with it because upgrading the unit from Refresh3 to Refresh5 does not work. Would cleaning the internal memory work and if yes how do I do that?