Unable to attach to IIS process

I have installed dotMemory 2018.3.4 on a Windows Server 2016 datacenter computer.

I'm trying to attach to the w3wp process.

The application says "Preparing the profiler..." for a minute or two and then eventually gives the error message:

Unable to start profiling
The system cannot find the file specified.

Any ideas on why I can't profile an IIS app on this machine?

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Hi Mark,

This error can occur if w3wp process does not contain running managed code.

What application (.NET Framework or .NET Core) do you run on IIS?

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The process did contain managed code.  I found that if I had the browser request a web page, then the profiler would finally load.  I had loaded web pages before trying to attach, so I know the managed code had already been loaded, but for some reason I also needed to request a web page after starting the attach for the profiler to fully initialize.

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If you need to profile your web site from the start you can run IIS profiling from dotMemory using "Local (Remote) | IIS" configuration.

> The process did contain managed code
You can check that it really contains initialized clr assemblies at the moment you try to attach. Process Explorer tool can show this information: https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer
Please enable 'View | Show Lower Pane' and 'View | Lower Pane View | DLLs' settings. If your application's target framework is .NET Framework, version >= 4.0, w3wp process have to contain clr.dll as well as not empty .NET Assemblies tab in properties (Right click on the process | Properties | .NET Assemblies tab).


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