"no address specified!"

My application's under borland midas 3.0, using remote datamodule and
TSocketConnection. both the Appserver and Client work fine on my pc with
Delphi 5.0 installed, but when i ran the Appserver on a WindowsNT4.0, some
operation in the client result a message "no address specified", (i had
register midalss.dll and dbclient.dll on that NT machine.) so if anybody
could please to tell me how could I resolve the problem?