Hi Boris,
The trace was executed and I couldn't find any error explicitly related to the error.
We tried to edit the connection inside the Information Design Tool and the following message was shown:
com.businessobjects.mds.olap.protocol.xmla.internal.XMLAException: ErrorCode: 401
Description: Unauthorized
Source:http://<BPC_Server>/sap/bpc/app/xmla/xmlawebservice.asmx
We tried also access the conection string (http://<BPC_Server>/sap/bpc/app/xmla/xmlawebservice.asmx) through web browser with the same user and password and the access was made and page loaded succesfully.
Thanks!!!
Bruno