We'll you're going to have to provide more details.
Or, better yet, post a link to a page that demonstrates this
problem.
If it is on an internal network, save the html source of an
offending page and "Attach Code" it here.
Can't tell much more otherwise.
It could be firewall, directory permission, mime-type, IIS
Setup, different directory, SSL issues, etc.
Personally, I would scrap IIS and immediately switch to
Apache.