I get a 'System error 5 has occurred. Access is Denied' error when I do:
net use t: \\server\transfer /user:bpm_r bpm_rxt
However, I get a successful map if I do:
net use t: \\server\transfer /user:bpm_r
... followed by a prompt for a password 'bpm_rxt' and type it in manually
Formatting the user id as: DOMAIN\user seemed to fix the issue.