NDMP restore issue

Hello People,

I want to restore old LTO3 tapes(written by an EMC Cellera) to same EMC Cellera

The ndmp host is configured. 

I have got a new Windows Server 2008R2 with NBU 7.5 installed. It´s my first time to restore with NDMP

In the Restore Manger I filled in the following configuration:

Server: My master server

Source Client: the ndmp filer 

Destination Client: the ndmp host, which is already configurated

Policy: NDMP

When I try to start the restore everything to differnt location, than this error will apear. Unable to connect to Netbackup host "myNdmphost"

Thanks for your help!

Henning