vista ent net use problem

i found that i can't use net use command to map lpt1 in vista ent version,

but i can map lpt2.

anyone know what is the problem in vista ent? i test in vista business, i

can map lpt1 and lpt2.

in vista ent, when i type "net use lpt1 \\server\printer"

it needs me to enter user name and pasword, however i tried all user still

can't map.

however, i type "net use lpt2 \\server\printer" , it is susscess to map.

anyone have this problem?

pls help~~~~ thx a lot~~~