Openhabian 1wire enabled -> OH2 connection timed out


I mounted the openhabian image on SD Card and pluged it to my raspi b+.
All worked fine.

After that, i wanted to integrate a ds18b20 sensor.

But after i enabled 1-wire in the raspi-config and rebooted, i cant reach the OH2 Server via ssh shell, neither with the browser.

Both report, connection timed out.

Can I still use 1-wire with OH2? And if yes, how to enable the bus correctly?

Additional question, where to put my bash, python scripts. I tried to make some directories, but always get the response: Read-only file system.

Thanks for any help