Andrew Lock 11/25/2025

Exploring the .NET boot process via host tracing

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This technical article details how to enable diagnostic host tracing in .NET to debug application startup issues. It explains the environment variables COREHOST_TRACE and COREHOST_TRACEFILE, walks through the boot process of a simple .NET app, and describes the roles of the muxer, hostfxr, and runtime in loading a .NET application.

Exploring the .NET boot process via host tracing

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