you said... "That would work if they were on different servers. I want them on the same server... so they have the same IP. DNS only resolves IP addresses. The issue has to do with IIS and it's FTP server."
It is impossible to bind port 21 more than once on a same IP address... unless you use two network card with different ip address and use DNS to resolve your domain and subdomain... You can only make use of this IIS feature if you use Window 2000 server (not professional version)
OR...
if you still want to use the same ip number, you have to have DNS too to help you....
try this configuration....
(Im sure that there is only one FTP server that is bound to port 21 on one network card right?...)
In your Internet Information Services, go to your ftp server properties under you computer/server name... on FTP server tab, in Identification frame set IP address as '[All unassigned]"
I think this is nothing to do with IIS's ftp server only thing that maybe you missed some configurations...
Thanks
Thanks