error code -2147012894 in ASP app after installing Project Server

[Alan]

Hi,

After installing Project Server 2003 on a Windows 2003 Server, I am getting
an error from a different ASP application hosted on the same server. The
error is code -2147012894. The asp application uses the msxml object on the
server side to do some processing, and from what I can tell, for some reason
it's trying to access the site via https (port 443) instead of the standard
port 80. Running tcpview when I try to access my asp application shows
dllhost.exe trying to access the server on port 443. The workaround is
adding port 443 in the IIS config for my application, but I'd like to find
the root cause and fix it there. So, does anyone know if installing Project
Server 2003 does anything with regards to msxml authentication, or any other
thoughts on how to remedy this?

Thanks,
Alan