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Editorial Team
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Asked: 2026-05-11T21:24:01+00:00

I have an application written in ASP.NET 1.1. If I switch IIS to use

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I have an application written in ASP.NET 1.1. If I switch IIS to use 2.0 what issues am I likely to see? Initial tests have thrown no problems, but I was wondering if anyone had experience of running ASP.NET 1.1 applications under 2.0 and could maybe point out some areas to watch out for?

Thanks for any advice.

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  1. Editorial Team

    Just make sure that you are not running different web applications in the same application pool if they require different versions of the .NET framework.

    Create separate app pools (at least one for each version of the framework).

    Maybe also have a look at this blog post by Brad Abrams about breaking changes between .NET framework 1.1 and 2.0. Here’s a short quote :

    …we work very hard to ensure that
    your V1.1 apps will this just work on
    2.0, but none-the-less, this doc is likely worth a quick scan as you
    migrate to 2.0

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