On a fresh installed environment i got errors while processing Cubes. Login failed errors and it is automatically using my machine name as a login user.
Process failed. Trace information is still being transferred. If you do not want to wait for all of the information to arrive press Stop.
Go to the data source of your Cube
Change ImPersonation Info from default and eter credentials for admin user or having necessary rights for deployment and processing of cube. and now process cube again
Bingo ! Cube processed