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My client this morning installed .NET Framework 4 on his IIS6 web server. He also updated the site I am working on to .NET 4, but now the site is serving no pages. I have just uploaded the entire site and all pages are available, yet any URL I try gives a 404 error.

Any ideas what might have happened?

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You need to enable the ASP.Net 4.0 Web Service Extension.

When you run

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i 

this installs the ISAPI filter, but doesn't actually enable it. On Windows 2003 servers you should actually run:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i -enable    
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Do any static html files works?

Have you tried re-registering the ASP.NET extensions after installing .NET 4?

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe /i
  • Static files are served fine. Waiting for the results of the re-register you reminded us of, thanks. – ProfK Jun 29 '10 at 7:44
  • any luck with the website? – commandbreak Jun 30 '10 at 8:42
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I did the same, except I installed v3.5 ... asp pages still works fine, html works fine, but php and aspx pages just loads forever.... pages which was definitely working before the installation of v3.5

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Don't know why, but .net 4 required re-start of the WWW service.
Also: so not mix .net 4 and .net 2 websites in the same app pool.

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