angel06,
I take it that you are trying to logon to SBS from the CNC machine CPU.
You did not state if you are providing a username & password when prompted and then it(SBS) re-prompts you for this information. I assume that you are.
Depending on what CAL implementation you have setup, you might have to setup the CNC as a device with a CAL. This is if the SBS & cal implementation is "per device" vs "per user".
Hope this helps
rvnguy
"I know everything..I just can't remember it all