1. Block obdev.at in /etc/hosts by adding a line:
127.0.0.1 obdev.at
how to edit hosts file
2. Block Little Snitch with Little Snitch, in Little Snitch Configuration click the New button, select Deny Connections at top, Choose Application: /Library/Little Snitch/Little Snitch UIAgent
I found a tutorial about what to do when the editing the hosts doesn’t work. It uses firewall in system preferences.
http://www.youtube.com/watch?v=Am5LOH0yBMk