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I have ASP.NET web services and ASP.NET web application running on .NET framework 1.1 hosted on a Windows Server 2003 IIS 6 machine.

I have a new application requiring on .NET 4. Until I installed ASP.NET framework 4.0, it was working fine.

Now my .NET framework 1.1 applications have failed.

How can you configure an IIS 6 instance to run 2+ applications each respectively requiring different versions of the .NET framework?

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Think this belongs on serverfault – Rune FS Jun 28 '11 at 16:17
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migrated from stackoverflow.com Jun 28 '11 at 17:56

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1 Answer

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You have to create at least two separate application pools - for two different frameworks. Then assign each application to run in the appropriate pool.

These links may help too:

http://wiki.onega.net/index.php?title=How_to_run_multiple_versions_of_the_ASP.NET_framework_simultaneously_on_an_IIS6_Server

IIS6 | Application Pools | ASP.NET Framework

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how to assign frameworks for two different app pools, i did not see any where assigning frame work in create application pool in iis6. i can see this in iis 7 – Pradeep Jun 28 '11 at 16:11
this info is not sufficient – Pradeep Jun 28 '11 at 16:12
sorry, let me clarify. you just set up separate application pools, you don't specify framework version for app pool. but in your web application you specify framework version in ASP.NET tab. – Kon Jun 28 '11 at 16:14
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