There are two options to choose from to fix this issue.
To work around this problem without installing the above update, reorder the handlers in the applicationHost.config file so that all three .NET 4.0 extensionless URL handler definitions are near the bottom of the handler mappings section. Below is an example of the bottom of the reordered handler mappings section with the extensionless URL definitions moved to the bottom of the section. Note that the example below uses new handler names for the extensionless URL handler entries. When you move the handler entries in your own applicationHost.config file, you should subsequently rename the handlers using the names shown below – e.g. "ExtensionlessUrlHandler-ISAPI-4.0_32bit", "ExtensionlessUrlHandler-ISAPI-4.0_64bit", and "ExtensionlessUrlHandler-Integrated-4.0".
and is not meant to be copy and pasted into your configuration file. It does not contain the entire handlers section of a standard configuration file but instead shows just the pertinent information described in this article. Always backup your configuration files before making any changes.
<handlers accessPolicy="Read, Script">
< [...unrelated handler mappings...] />
<add name="TRACEVerbHandler" path="*" verb="TRACE" modules="ProtocolSupportModule" requireAccess="None" />
<add name="OPTIONSVerbHandler" path="*" verb="OPTIONS" modules="ProtocolSupportModule" requireAccess="None" />
<add name="ExtensionlessUrl-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG" modules="IsapiModule"
scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32"
responseBufferLimit="0" />
<add name="ExtensionlessUrl-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG" modules="IsapiModule"
scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64"
responseBufferLimit="0" />
<add name="ExtensionlessUrl-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG" type="System.Web.Handlers.TransferRequestHandler"
preCondition="integratedMode,runtimeVersionv4.0" />
<add name="StaticFile" path="*" verb="*" modules="StaticFileModule,DefaultDocumentModule,DirectoryListingModule"
resourceType="Either" requireAccess="Read" />
</handlers>