Problems running Exchange 2013 CU5 PrepareAd on Schema Master in empty Root doamin

Hi,

I'm upgrading a customers Exchange 2013 SP1 to CU5, the Exchange servers are in a child domain.

Running Prepare Schema and PrepareAllDomains are successfull, but PrepareAD fails with "Unable to connect to: mydc.domain.com" The LDAP service are not running !

I did not have this problem when running it for Exchange 2013 SP1.

Any Ideas ?

Thanks

/Geir

Exchange 2007