MKR1000 connection problem to open network

Hello there.
I tried different ways to connect my Arduino MKR1000 to Thinger.io plattform with an open network with no encryption from my city.
However the Arduino MKR1000 works with WPA2 networks at home. And it’s also not a matter of my SSL certification, it’s up to date. And because it works with my home networks, the code should be correct.
Even when i try to make a hotspot out of my open network and give it a WPA2 encryption it doesn’t work. Is there any issues with open networks?
All libraries and firmware are up to date.
The error output is always:

I would be glad for any advice :slightly_smiling_face:

Hi, you need to install the SSL certificate in your device. Check out the documentation:

http://docs.thinger.io/arduino/#supported-hardware-arduino-mkr1000

Best.