Problems getting SOAP Webservice running under IIS 6

I have a SOAP dll written that talks to a SQL database to retrieve records 
and sends them to the application.  I've tested it on my XP Pro workstation 
and verified that the call to 
http://localhost/propartsISAPI/propartsISAPI.dll generate the correct WDSL 
web page and that after downloading the XML that my test app does 
communicate with the above webservice and it returns the correct data.

All well and good!

Today I tried migrating it to the production IIS 6.0 web server and all it 
does is prompt me to download the dll file.  I have gone into IIS 6 and set 
it up identical to the IIS 5.0 settings on my workstation.  In addition, I 
added the propartsISAPI.dll file to the Web Service Extensions and marked it 
as "allowed" so it would execute.  Still wants to download instead of
treat 
it as a CGI type app.

I'm sure I'm going to slap my forehead later, but what have I overlooked?

Help!!

> I'm sure I'm going to slap my forehead later, but what have I overlooked?

Yep, a head slapper to be sure!  It always help to make sure you don't have 
TWO copies of the domain in IISAdmin.  I had been changing the one that was 
NOT referenced by the URL.  Works like a charm.