Is the default page a .htm page or dynamic(like .asp)? I would try a simple .htm first. It seems like it's finding your server when you use the IP (based on the message), just not the specific page. Also, double-check the properties in the IIS console, particularly the default pages, etc...
>I've gotten IIS running on Windows 2000 pro (SP2). I am connected to the internet via a cable provider that assigns a dynamic IP. I can access the web server with http://localhost/ but not via the IP address. I determine the IP address by running IPCONFIG in the command window. The error I get is "HTTP 404 - File not found".
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>Any ideas as to what to try? I would like to access the webserver from another location to test the webserver apps.