Dear all, I am trying to publish virtual SMTP service that came with IIS5.0 on the Internet. Our server has two NICs, the first one has an internal ip address and the second one has a public ip address(dedicated leased line). IIS5.0 is on the same as ISA server that's why we need to pass a certain steps. When I execute "mdutil set ?path smtpsvc/1 ?value 1 ?dtype 1 ?prop 1029 ?attrib 1" it return as the following: Error: SetValueByDataType failed - HRES(0x80070057) ERROR_INVALID_PARAMETER Any ideas would be much appreciated. Rgds, Sothun