Crystal Reports Viewer gets no Connection to BO Central Management Server

Hi,

I start Crystal Reports Viewer.

I try to open aCrystal Report stored in BO Edge 3.1 CMS Server.

I get the message: "Connection to Server could not be established ... . Try again later ... ."

My Host ist nst01.

My CMS / Server is running on http://NST01:8080.

All Services in the CMC are running.

My password is correct.

I tried the following Server Connections / Webservices :

http://NST01:8080/CrystalReports

http://NST01:6400/CrystalReports

http://nst01:8080/CrystalReports

http://nst01:6400/CrystalReports

What's the correct connection ?

What's wrong ?

What configuration is missing ?

Thanks

Martin