If I try to ping it from the second VLAN I also dont get an response. Maybe there is some kind of locale firewall in flasphoner or the ubuntu server which declines the calls?
There is not any local firewall function in WCS itself. So you should to check ports avalability using netcat and tcpdump as described here: Port routing checking.
But if you even cannot ping the server where WCS is installed, it is definitely either firewall or router (which connects those two VLANs) issue.