Problem accessing DCOM Server on NT4 Server from 2003 Server

Guest

I have been asked to set up a new webserver (IIS) on W2003 Server R2.
This is to replace the old NT4 Server system.

There is a lot of legacy VB6 code running on the systems.

I am experiencing problems accessing a DCOM server, from the 2003
Server, that is running on an NT4 Server.

I have read that there are issues regarding the security changes on
2003 that cause problems with DCOM but have followed all the
suggestions with regards to allowing IUSR_<machinename> access to teh
various Windows folders and granting permissions to this user in the
dcomcnfg but all to no avail.

At present when I try and create the object using
Set o = Server.CreateObject("L_Cache.clsCachedData")
I am returned the following error.

006~ASP 0177~Server.CreateObject Failed~800706a8

Any advice or suggestions would be much appreciated,.