Crystal Reports for Enterprise XI 4.0 Connect to BOBJ BI 4

Hi There,

we are facing a curious problem connecting SAP Crystal Reports for Enterprise XI 4.0 against

BOBJ BI Platform 4.0.

Only one client PC running Crystal Reports can connect to the server (Win 7 (32bit)). All other

clients / computers do receive a message during connection sounding like this:

"At the moment you cannot connect to SAP BusinessObjects Enterprise. Please try it again later."

GERMAN: " Momentan ist keine Anmeldung bei SAP BusinessObjects Enterprise möglich.

Versuchen Sie es zu einem späteren Zeitpunkt noch einmal."

We checked following:

- there are enough client licences on the server

- we tried using different usernames

- we can (!!) connect to the server using HTTP-Links (like ... /BOE/CMC and .../BOE/BI)

- we tried it on several clients using Win XP (32bit), Win 7 (64bit), Win 7 (32bit)

- Switches off all Windows Firewalls (all Clients and Servers)

- Checked Java-Versions

Still only one client can connect to the server without problems.

What did we wrong? Might there be a connection problem using java? Or a missing component?

Thanks in advance.

Kind regards,