Anybody knows how to register IIS in another server to access database MS SQL in defferent server.

When I try to run ASP.NET app with IIS and MS SQL all in one machine that was no problem at all but prior to that I still have to register in MS SQL user call ASPNET for IIS in that particular server. But when IIS and AS.NET app in one server and MS SQL in another server that is SQL aunthentication problem. "not authorise it seems". I cant register because ASPNET for IIS in another server not exist in the list. fyi these 2 server are member server for 1 domain.

Healp me?