The worker process fails. The app doesn’t start.
The ASP.NET Core Module attempts to start the .NET Core CLR in-process, but it fails to start. The cause of a process startup failure can usually be determined from entries in the Application Event Log and the ASP.NET Core Module stdout log.
Here you can find more info: Troubleshoot ASP.NET Core on Azure App Service and IIS | Microsoft Docs
This happens when there are many application pools on the same machine. Microsoft recommends to stagger the startup process of multiple apps. Another solution would be increase the start up limit. You can also try set OutOfProcess through Project->Right-click–>Properties–>Debug–>Managed model
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Answers
if you publish at the same IIS the most commont issue could be an application pool. Try to create a separate application pool for this webapi
The worker process fails. The app doesn’t start.
The ASP.NET Core Module attempts to start the .NET Core CLR in-process, but it fails to start. The cause of a process startup failure can usually be determined from entries in the Application Event Log and the ASP.NET Core Module stdout log.
Here you can find more info: Troubleshoot ASP.NET Core on Azure App Service and IIS | Microsoft Docs
This happens when there are many application pools on the same machine.
Microsoft recommends to stagger the startup process of multiple apps. Another solution would be increase the start up limit.
You can also try set OutOfProcess through Project->Right-click–>Properties–>Debug–>Managed model
More solutions can view this post