Have you ever encountered that your ASP.NET (aspx) page is not working although you have installed Internet Information Services (IIS) and .NET Framework? This could happen if the IIS was installed after the .NET Framework, which cause some missing Application Mapping in IIS.

This could be fixed by following:
A. Run the Fix-IIS-Mapping-for-ASP-NET.exe utility:

Click Start, and then click Run.
In the Open text box, type cmd, and then press ENTER.
At the command prompt, type the following, and then press ENTER:

"%windir%\Microsoft.NET\Framework\%version%\aspnet_regiis.exe" -i

In this path, version represents the version number of the .NET Framework that you installed on your server. You must replace this placeholder with the actual version number when you type the command.
B. Register the Aspnet_isapi.dll:

Click Start, and then click Run.
In the Open text box, type the following, and then press ENTER:

regsvr32 %windir%\Microsoft.NET\Framework\version\aspnet_isapi.dll

Regsvr32 returns the results of the registration.

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