Eric

Hello;

We have a custom application that uses http to
communicate from a workstation to an IIS server - the app
basically takes over Windows authentication (GinaDLL),
and authenticates the user through a database connected
to the web server.

This used to work flawlessly under Win2K server and IIS5,
but now that we've upgraded to Win2K3 and IIS6, the
workstations cannot communicate any longer with the web
server...can anyone either enlighten me as to what may be
causing this problem, or point me to some docs that
highlight the security differences between IIS5 and IIS6?

I should add that under Win2K server and IIS5, the
application would fail to communicate if a firewall was
installed (ZoneAlarm Pro), even though all other http
traffic was getting through ok...

Any ideas will be greatly appreciated!

Thanks,
Eric.