Tuesday, October 9, 2012

HTTP Error 500.21 - Internal Server Error Handler "PageHandlerFactory-Integrated" has a bad module "ManagedPipelineHandler" in its module list



I just deployed a brand new .Net 4 website in IIS on my machine and get this error:





It seems that some .Net 4 modules have not been installed properly on this machine…

I managed to fix the issue quickly by running those two commands:

%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i
%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i


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