While Installing Clean Windows Web Server 2008 R2 64-bit with IIS 7.5, If you receive the following errors when opening .NET 2.0 / .NET 4.0 application:
1. Managed handler is used; however, ASP.NET is not installed or is not installed completely. OR
2. IIS 7.5 error: Handler PageHandlerFactory-Integrated has a bad module ManagedPipelineHandler in its module list.
Running the following commands will solve this issue:
For 32-bit:
%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i
For 64-bit:
%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i
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