vRB7 can't collect data from vRA7. data collection status error

Hey all,

I've connected a vRB appliance to vRA. but data connection fails.

The error:

Could not read [null]; nested exception is org.springframework.oxm.UnmarshallingFailureException: NPE while unmarshalling. This can happen on JDK 1.6 due to the presence of DTD declarations, which are disabled.; nested exception is java.lang.NullPointerException

I've checked the log files, found the error message. but no indicators arround it.

Don't even know where to start looking.

Both appliances are version 7 (no updates available). Its a testlab so I'm open for suggestions. I'm currently planning to deploy into production

Thanks!

Kalli