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Editorial Team
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Asked: 2026-05-15T13:29:29+00:00

I have the .NET Target framework set to .NET Framework 3.5 When I try

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I have the .NET Target framework set to .NET Framework 3.5

When I try to debug with f5, i get the following message in a popup window:
“Unable to start debugging on the web server. Mixed-mode debugging of x64 processes is not supported when using Microsoft.NET Framework versions earlier than 4.0.”

Of course when I set the target framework to .NET 4.0 it works fine. However my web server only supports up to 3.5 so I have to try and make this work with 3.5.

The closest match to a googled solution is found here:
http://msdn.microsoft.com/en-us/library/dd409790.aspx

however when I try to follow the steps to change the platform to x86, the setting it tells me to change simply isn’t there. The closest thing is project properties -> Build -> Platform target, and that doesn’t fix the problem.

What am I doing wrong?
THANK YOU FOR YOUR TIME

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1 Answer

  1. Editorial Team

    What you need to do is disable mix-mode debugging. That is simultaneously debugging native and managed code. That is what’s causing the issue here.

    • Right click on the startup project and select properties
    • Go to the Debug tab
    • Uncheck the box which says “Enabled unmanaged code debugging”
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