IIS 7, HttpHandler and HTTP Error 500.21

Question

On IIS 7, I\'m trying to use custom HttpHandler for my ASP.NET web application. I use pipeline mode \"classic\", .NET version is 4.0.30319, my web.config configuration for t

Answer 1

This situation happens because you haven't installed/start service of ASP.net.

Use below command in windows 7,8,10.

%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i