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Home/ Questions/Q 6353825
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T22:28:38+00:00 2026-05-24T22:28:38+00:00

I have a website for .net-framework 3.5 with WebForms I am running it on

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I have a website for .net-framework 3.5 with WebForms
I am running it on two servers Windows 2008 R2 server with IIS7.5
And Windows 2003 Server with IIS6

On IIS7.5, when I run my website under .NetFramework 3.5 or 4, it runs fine.
On IIS6, when I run my website under .NetFramework 3.5 it works fine, but when I run it under 4.0, I get 404 errors and site doesn’t work.

What could be wrong? How to fix this?

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  1. Editorial Team
    Editorial Team
    2026-05-24T22:28:40+00:00Added an answer on May 24, 2026 at 10:28 pm

    try

    cscript c:\windows\system32\iisext.vbs /EnFile C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll
    

    After executing this your .NET 4 apps shouldn’t show any 404 errors anymore… Windows 2003 should at least have SP1 installed for this…

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