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Editorial Team
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Asked: 2026-05-14T20:11:56+00:00

We have deployed a .net 4 asp.net site on IIS 6.0. Default.aspx is configured

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  1. We have deployed a .net 4 asp.net site on IIS 6.0.
  2. Default.aspx is configured as one of the default document.
  3. When we access the site using the following url

http://testsite

We expect it to render

http://testsite/Default.aspx

But instead we get 404 Not found error. We did not had this issue when it was deployed on .Net 2.0. Only thing that has changed on the server is that we use .NET 4 instead of .NET 2.0.

UPDATE: I tried the following link but it did not work.

Getting an ASP.NET 4 application to work on IIS6

The framework version on the server is .NET 4 RC. Will it help if we install the latest .NET 4 version on the server?

Update: The issue is resolved now. The problem was a Third party upload control that we were using which added its own HttpHandler in Web.Config. This HttpHandler started failing in the .NET 4.

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1 Answer

  1. Editorial Team

    Check the server logs, they will probably give you a better idea of what is going on.

    You can find the path to the log file by right clicking the website in IIS and go to properties. Then goto the Web Site tab, under ‘Enable logging’ click properties and the logging properties window will show up which displays the path to the log file.

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