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Editorial Team
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Asked: 2026-05-30T06:51:29+00:00

I’ve got a web application that won’t run in debugging mode in Visual Studio.

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I’ve got a web application that won’t run in debugging mode in Visual Studio. Running on Windows 7 computer with IIS 7 installed.

Visual Studio Error

I’ve seen the numerous articles on the internet about re-installing the .NET versions, but this has not solved it for me. The project still refuses to compile.

In the Event Log there are several entries when I’ve started the debug process:

Event Log Error

With a corresponding entry above it:

Corresponding Event Log Entry

As stated I have run the .NET registration aspnet_regiis -i for both v2, v4 both 32/64 version of the .NET to no avail.

The error seems to point to the ISAPI filters, which I have tried fiddling with and configuring without success:

ISAPI on dev computer

I’m now at a loss as to what’s causing the problem.

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1 Answer

  1. Editorial Team

    This message is saying you’re loading the 32bit aspnet_isapi.dll in a 64 bit w3wp.exe process.

    You can check the application pool “Advanced Settings” for your 64 vs 32bit settings and select the correct one:

    enter image description here

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