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Home/ Questions/Q 7179207
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T17:05:38+00:00 2026-05-28T17:05:38+00:00

I am using a really old website running on .net 2 but I am

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I am using a really old website running on .net 2 but I am adding an addition to it that is MVC 3 running on .net 4, created as a virtual directory under the original website.

The problem is that if I get the “Server Application Unavailable” with one of the frameworks I can run aspnet_regiis for that framework and it fixes it but then it make the other framework give this error

I fix one it breaks the other

is there any way around this

I need this asap, client is breathing down my neck

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  1. Editorial Team
    Editorial Team
    2026-05-28T17:05:38+00:00Added an answer on May 28, 2026 at 5:05 pm

    Just create two application pools targeting each respective framework.

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