Error occurred while reading the selected user mapping data

Dear all,

System Details:

Ecc 5, nw04, ep6. QAS abap and JQE (sid) portal on seperate servers. UME option java database.

Details:

While mapping the user to SAP_WebDynpro_Xss i m getting the error mentioned in subject.

My user id and passwords are correct and working fine in QAS system, what to check, please.

Regards

Imran