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The ASP.NET tab of IIS Manager does not appear when you retrieve the properties for a virtual directory in IIS Manager

SYMPTOMS
When you retrieve the properties for a virtual directory in Microsoft Internet Information Services (IIS) Manager, the ASP.NET tab of IIS Manager does not appear. Alternatively, the Edit Configuration button on the ASP.NET tab is disabled.

This problem occurs when any one of the following conditions is true:
  • You are using the 32-bit version of IIS Manager on a 64-bit computer.
  • You are using IIS in Microsoft Windows-32-on-Windows-64 (WOW64) mode.
  • You have set the Enable32bitAppOnWin64 property to True in IIS. This setting lets IIS run in 32-bit mode on a 64-bit computer.
Note WOW64 is an emulation layer that enables 32-bit Windows-based applications to run seamlessly on 64-bit computers.
CAUSE
This problem occurs because the 32-bit version of IIS Manager is incompatible with 64-bit computers that use Microsoft ASP.NET.

This problem can also occur because the 64-bit version of IIS Manager cannot load the 32-bit Aspnet_isapi.dll file as a native 64-bit file. Additionally, the 64-bit version of IIS Manager cannot load this file in WOW64 32-bit mode.
WORKAROUND
To work around this problem, set the Enable32bitAppOnWin64 to False in IIS.

REFERENCES
For more information about how to configure IIS to run 32-bit applications on 64-bit computers, visit the following Microsoft Web site:
Properties

Article ID: 919283 - Last Review: 06/29/2011 16:48:00 - Revision: 4.0

Microsoft ASP.NET 2.0, Microsoft Internet Information Services 6.0

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