>Thank for the reply.
>
>Sorry, what means UNC??
>

A universally-resolvable name for a shared resource, normally in the form:

\\ServerName\ShareName\path name

It does not depend on drive mappings at all.

>Beside the above error msg, when I check the display error at the check box of connection designer, following error also come out
>
>warning : the query timeout cannot be set
>warning : connection sync/async mode cannot be set.
>
>What is the problem??

I don't know; it's not a problem I've seen. I'd guess that it cannot connect or set various DSN parameters.