I just got it:
We´ve installed Emulex OneCommand Manager to monitor the hosts.
That Service "EmulexOCMVMwarevCenter" seems to "block" the start of the "vmware virtualcenter management webservices"
When I stop the Emulex-Service and then start the vmware-service then the vmware-service keeps alive.
When I then start the Emulex-Service additionally, both services stay alive.
So I made a service-dependency for the emulex-service to the vmware-server, so I think it should be ok now...
The vf.tc-events.txt comes now up with
2013-05-16T15:23:50,INFO,ComponentStateChangeEvent,instanceIdType=self|instanceId=self|timestamp=2013-05-16T15:23:49|state=on
so I think this also should be ok....