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Can't monitor .NET framework 3.5 application


Hi Team,

We have installed dotNetAgentSetup64- in my machine. And we are trying to profiler .NET framework 3.5 application. Early my application working fine without any issue but after installing appDynamics .NET agent it got some issues.

In Event viewer, I got the below message

.NET Runtime version 2.0.50727.9171 - Fatal Execution Engine Error (00007FFB20973E86) (80131506)

and another error message as,

Faulting application name: w3wp.exe, version: 6.2.20348.1, time stamp: 0x405e4c14
Faulting module name: mscorwks.dll, version: 2.0.50727.9171, time stamp: 0x64501630
Exception code: 0xc0000005
Fault offset: 0x0000000000255939
Faulting process id: 0x%9
Faulting application start time: 0x%10
Faulting application path: %11
Faulting module path: %12
Report Id: %13
Faulting package full name: %14
Faulting package-relative application ID: %15

Kindly let me know, Why i am getting this issue after installing Appd .NET agent.

And how to profile my .NET framework 3.5 application with APPD?




AppDynamics Team

Hi Jebas,


DotNetAgent version 23.6 doesn't support .Net framework 3.5.


  • Microsoft .NET Framework: 3.5 SP1, 4.6.2, 4.7.x, 4.8.x
  • Microsoft .NET: 6, 7


The last version of dotnet agent which officially supports .NET Framework above is 21.9.

Microsoft .NET Frameworks

Microsoft .NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.2, 4.6, 4.7, and 4.8 on these runtime environments


AppDynamics only supports versions of .NET Framework that Microsoft currently supports. Previous versions not listed are not supported by Microsoft, or by AppDynamics. See Microsoft .NET Framework Supported Versions


Hope this answer could be helpful.


Thank you for your information @Xiangning.Mao .

As per the AppDynamics agent version 23.6 document,  


  • Microsoft .NET Framework: 3.5 SP1, 4.6.2, 4.7.x, 4.8.x
  • Microsoft .NET: 6, 7

In My application target framework version was .NET framework 3.5.  And already installed .NET framework 3.5 SP1 in my machine.


Where i missed here? Do I have to change anything other to get monitor my application in AppDynamics?

Thanks ,


Hi Jebas,

Have you built your application with .Net Framework 3.5 SP1?

If you want to monitor applications built with .Net Framework 3.5, please download dotnet agent version 21.9 to see how it goes.