First of all, I got it working. But before providing all the details I'm still struggling with an annoying behavior.
Yes it seems that OCSP is only working in the Common partition, so I created (as already mentioned from the existing configuration) a "forwarding" VS in the Common partition. The reason, that I don't saw any traffic as mentioned in my previous posts seems to be related to a missing route in the Common partition. Although the VS is somehow directly connected, the internal traffic handling seems to first check the routing table (I guess some F5-expert can shade some lights on it). I removed the route again to double check if it's really the issue and yes it's not working anymore (the internal VS will not be triggered anymore). But now the strange thing is, when I add the route again it's still not working anymore. I had the same issue already this afternoon, but it was working again after while and after some changes (but I don't know which ones).
So does anyone out there knows this behavior/issue and how to solve it?
Thank you!
Ciao Stefan :)