Ancm failed to start within startup time limit

In my case it gave me some additional - albeit not very useful - information on what is failing in the form of a stack trace that I'm outputting as part of my main program error handling. This logs out Console output as well as logging output. What this does is log stdOut into a file in the logs folder which should in most cases given you some additional information. So the first thing I always do when I have IIS hosting startup problems is to enable the logs by turning on the stdoutLogEnabled='true' in the web.config of your server installation (or you can add a pre-configured web.config to your project). 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. NET Core CLR in-process, but it fails to start. The ASP.NET Core Module attempts to start the. The link at the bottom takes you to a detailed page that talks about a number of hosting failures but didn't help much in the case of InProcess startup failures. The ANCM (ASP.NET Core Module) error message page is scary because it doesn't provide much in the way of debugging information on the page itself. What gives? Debugging Server Startup Failures So in this case InProcess hosting is failing while OutOfProcess hosting is working. This project configuration value translates to a web.config setting in the IIS publish output folder: NET Core 3.0/3.1 has InProcess hosting on by default, but you can explicitly configure the value in the project via the AspNetCoreHostingModel explicitly. NET Core 3.1 server OutOfProcess was working without problems, but as soon as I tried switching the server to InProcess I get this dreaded ANCM In-Process Start Failure error page: NET Core host right into the IIS host process which provides better performance and a smaller footprint. InProcess hosting uses a custom IIS Module that bootstraps a custom. OutOfProcess hosting externally runs Kestrel.exe and has IIS proxying requests into the external Kestrel HTTP host. NET Core 3.x InProcess hosting for IIS is the default.

If you're not familiar with ASP.NET Core hosting in IIS, here is a previous post that provides more insight on the two hosting modes, how they work and how they differ (post is for 2.2 but still applies for 3.x): I ran into a nasty issue yesterday related to hosting an ASP.NET Core 3.1 server application in IIS using the default InProcess hosting.

Ancm failed to start within startup time limit