500 Internal Server Error is one of the most common IIS server errors I see daily basis. Most of the time, a coding or configuration issue causes this error.
In a case I have recently worked on, the page was displaying the error below if the user tries accessing the root of the application. There were no issues if they enter the full path.
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Every once in a while, I come across an issue where the IIS binding is deleted unexpectedly or the SSL certificate in the IIS binding is replaced or removed for some reason. In one of these cases, I saw “SSL Certificate Settings deleted for endpoint” warning message in Event Viewer:
Read MoreEvent ID 15300 (HttpEvent)
SSL Certificate Settings deleted for endpoint
If you want to test ASP.NET functionality in a web server, feel free to use the code below. This is the easiest way of making sure IIS can render ASPX pages.
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