orchestrator
2025.10
true
- Getting Started
- Requirements
- Best Practices
- Installation
- Updating
- Identity Server
- Troubleshooting startup errors
Orchestrator installation guide
Last updated Mar 24, 2026
Troubleshooting: HTTP Error 500.30 ASP.NET Core app failed to start
This error occurs when the ASP.NET Core Module attempts to start the .NET Core CLR in-process, but does not succeed, preventing the application from starting. The cause can usually be determined by checking the Application Event Log and the ASP.NET Core Module stdout log.
Figure 1. Startup error page
How to identify the exception
- Open the Windows Event Viewer or the Azure Event Log for Azure App Service.
- Look for an event containing
Level `Error`andSource `.Net Runtime`. This is followed by two other events containingSource `IIS AspNetCore Module V2`.