A Web service returns an HTTP 404 (File Not Found) error

Problem

Attempts to call a Web service return an HTTP 404 (File Not Found) error.

Cause

This error can occur if ASP.NET is not installed and/or enabled on the IIS server that hosts the Web service.

Resolution

Ensure that ASP.NET is installed and enabled. Install the .NET Framework if it is not installed and/or run the aspnet_regiis.exe program located in the %WinDir%\Microsoft.NET\Framework\vXXX.XXX\ folder of the IIS server.

Source: Microsoft