Web Forms applications may have platform-specific requirements.

You may need to enable ASP.NET services on the server, and ActiveX controls and plug-ins on the client computers.

• Enabling ASP.NET Services
  By default, IIS is installed on Windows Server 2003 in a secure mode that prohibits ASP.NET. This means that only static pages can be served.
• Enabling ActiveX Controls and Plug-ins
  Web Forms application users may need to enable the running and scripting of ActiveX controls and plug-ins.