backup to disk error: 'cannot access directory Logon failure: unknown user name or bad password'

I had to update the firmware on my backup to disk device, and lost some settings.  ever since then i have been unable to backup to this unit and get a 'cannot access directory  Logon failure: unknown user name or bad password' error. 

I am able to map to this device from the backup the windows explorer, so i guess i need to know where to configure the account the data protector uses for access?

thanks