Why is my ASP.NET Core InProcess Hosting Failing with ANCM In-Process Start Failure?

Troubleshooting ASP.NET Core In-Process Hosting Issues: ANCM In-Process Start Failure

Migrating an ABP .NET Core MVC project (version 2.2) to the InProcess hosting model for performance gains encountered a "HTTP Error 500.30 - ANCM In-Process Start Failure." This issue highlights a common deployment challenge.

Root Cause Analysis:

The error indicates a missing AspNetCoreModuleV2 module on the server. IIS InProcess hosting relies on this module, which isn't universally present.

Resolution Strategies:

The simplest solution is to temporarily switch back to the OutOfProcess hosting model. Modify your web.config file, setting <aspnetcorehostingmodel> to OutOfProcess.

A more permanent fix involves installing the .NET Hosting Bundle on the target server. This bundle includes the required AspNetCoreModuleV2, enabling InProcess hosting.

Summary:

While InProcess hosting offers significant performance advantages in ASP.NET Core 2.2, ensure the necessary ANCMV2 module is available. If immediate deployment is crucial, reverting to OutOfProcess hosting provides a quick workaround. Installing the .NET Hosting Bundle is the recommended long-term solution for utilizing InProcess hosting's performance benefits.

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