Hi Jebas,
DotNetAgent version 23.6 doesn't support .Net framework 3.5.
https://docs.appdynamics.com/appd/23.x/23.6/en/application-monitoring/install-app-server-agents/net-agent/net-supported-environments
Runtimes
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.
https://docs.appdynamics.com/appd/21.x/21.9/en/application-monitoring/install-app-server-agents/net-agent/net-supported-environments
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.
Xiangning
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