essbase different behaviour with different eas server

Hi , this looks like a puzzle.

All even described here is happening at one eas console with 2 different eas servers and one essbase server.

eas server A -- 11.1.2.3.500

eas server B--11.1.2.3.500

essbase server-11.1.2.3.500

open eas console (thick or thin) , connect to eas server A, then add essbase server, expand it and expand the apps. all success.

open eas console (thick or thin) , connect to eas server B,then add essbase server, message shows login succeeded , now click on the + essbase server , nothing shows up. message in the panel shows succeeded .

Admin user id is used.

Both eas server are in same data center.