Hi Michel,

Unfortunately, there is nothing in the event viewer that shows what took place.

I looked deeper and selected the 'Web Server Extensions' folder in the Web Sites folder of IIS and noticed the extension for ASP.NET v4.0 had a status of Prohibited. I changed this to be allowed and got past this issue.

Thanks all for your suggestions as they made me look at other things.

Bob


>>I have recently converted a web application to .NET 4. I am attempting to deploy it to my Windows 2003 server. Now I have successfully deployed it to a Windows 2008 Server and another Windows 2003 Server (for testing purposes). But when I deploy it to my production Windows 2003 Server (running IIS 6), I get an error, namely:
>>
>>HTTP Error 404 - File or directory not found.
>>
>>How can I determine what file or directory is causing this problem? Or what am I missing?
>
>The Event Viewer should have a descriptive information on that issue.