The 401 error is the result of the fact that the windows user you have entered in the XMLA Setup dialog is invalid or does not have access to XMLA physical folder.
Please click the Ignore button. Setup XMLA connection manually by creating XMLA virtual directory as described this document: http://technet.microsoft.com/en-us/library/cc917711.aspx. You can register the connection in ReportPortal. Go to Admin > Connections. Select XMLA URL for connection type and xmla/msmdpump.dll for connection string. Click Add to add the connection.