Why I get 500 internal server error in asp.net core hosted in IIS?

Question

I published my .Net core web to IIS in localhost. In my code I use HttpClient.GetAsync to retrieve information from external resource. The HttpClientHandler is configured with ' UseDefaultCredentials = true '. Everything is working fine when running under IISEXPRESS. In IIS I get 500 'internal server error' on response from HttpClient.GetAsync

Installed the host bundle and tried many things but nothing worked.

Help please!

Answer 1

Thanks for Alex and RedgoodBreaker's suggestions. Their suggestions are correct, and the problem can be located quickly.

1. Windows Event Viewer

Open Event Viewer -> Windows Logs -> Application

2. Log creation and redirection

Enhanced diagnostic logs

3. Enable Failed Request Tracing Settings

Offical doc: Using Failed Request Tracing Rules to Troubleshoot Application Request Routing