Thanks to Doug Kennard
Original Post
Original Post
HTTP Error 500.21 - Internal Server Error
Handler "PageHandlerFactory - Integrated" has a bad module "ManagedPipelineHandler" in its module list.
I knew the website worked correctly, because it ran fine in the Visual Studio Development Server, just not in IIS 7. Apparently, the reason I was recieving the Internal Server error message was that I had installed SQL Server 2008, after installing Visual Studio 2010, and because of this it corrupted the IIS Machine level configuration files ("If you install VS2010 and then install VS2008 and VS2008 SP1, the configuration files for ASP.NET in IIS only include about 1/2 of the correct .Net 4.0 configuration sections." read more here).
To repair this problem I ran a full silent repair of the .NET Framework 4.0. Here's how on either a 32 bit or 64 bit computer:
- Click Start -> All Programs -> Accessories -> Run
- In the Open textbox paste in the following line (see list of all .NET Framework version install, repair and unistall command lines here):For silent repair on 32 bit computer with .Net Framework version 4.0.30319 use:
%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe
/repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart
%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe
/repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart
3.Click OK to start the repair
4.After, the repair ran for a few minutes, I restarted IIS 7.5, and things began to work correctly!
Hopefully, that will work for you...
Some people also seem to be having success correcting this error by running aspnet_regiis.exe. I initially tried this and it did not work for me, but feel free to give it a shot. (Keep in mind for the example below I have .Net Framework version 4.0.3.0319 installed on my computer, but you may need to change directory version to what is installed on your computer): Here's how to run aspnet_regiis.exe:
1. Run "aspnet_regiis.exe" program from command line (within Command Prompt):
run
%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe –i
%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe
–i
%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe
–i