How to switch between the 32-bit versions of ASP.NET 1.1 and the 64-bit version of ASP.NET 2.0 on a 64-bit version of Windows (894435)


The information in this article applies to:

  • Microsoft Windows Server 2003, Standard x64 Edition
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Datacenter x64 Edition
  • Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
  • Microsoft Windows XP Professional 64-Bit Edition (Itanium)
  • Microsoft Windows XP Professional x64 Edition

INTRODUCTION

This article discusses how to switch between the 32-bit version of Microsoft ASP.NET 1.1 and both the 32-bit version and the 64-bit version of ASP.NET 2.0 on a 64-bit version of Microsoft Windows.

When you install both versions of ASP.NET, you may receive error messages if you do not perform steps to enable each ASP.NET environment to run in Microsoft Internet Information Services (IIS) 6.0. For example, when ASP.NET is not set up correctly, you may receive the following error message from a Web page:
Service Unavailable
Error messages that are similar to the following may be logged in the Application log. Event ID: 2268
Source: W3SVC-WP
Category: None
Description:
Could not load all ISAPI filters for site/service. Therefore startup aborted.Event ID: 2274
Source: W3SVC-WP
Category: None
Description:
ISAPI Filter 'C:\WINDOWS\Microsoft.NET\Framework\v2.0.40607\aspnet_filter.dll' could not be loaded due to a configuration problem. The current configuration only supports loading images built for a AMD64 processor architecture. The data field contains the error number. To learn more about this issue, including how to troubleshooting this kind of processor architecture mismatch error, see http://go.microsoft.com/fwlink/?LinkId=29349.

MORE INFORMATION

IIS 6.0 supports both the 32-bit mode and the 64-bit mode. However IIS 6.0 does not support running both modes at the same time on a 64-bit version of Windows. ASP.NET 1.1 runs only in 32-bit mode. ASP.NET 2.0 runs in 32-bit mode or in 64-bit mode. Therefore, if you want to run ASP.NET 1.1 and ASP.NET 2.0 at the same time, you must run IIS in 32-bit mode.

Before you can switch between the different versions of ASP.NET, visit the following Microsoft Developer Network (MSDN) Web site to download and install both the .NET Framework 1.1 and the .NET Framework 2.0:

http://msdn.microsoft.com/netframework/downloads/updates/default.aspx

For example, if you are running Microsoft Windows x64 Edition, download the following two redistributable packages:
  • The .NET Framework Version 2.0 Redistributable Package x64 (64 Bit)
  • The .NET Framework Version 1.1 Redistributable
After you install the redistributable packages, you can switch between the different versions of ASP.NET. To do this, follow these steps for each ASP.NET version:

ASP.NET 1.1, 32-bit version

To run the 32-bit version of ASP.NET 1.1, follow these steps:
  1. Click Start, click Run, type cmd, and then click OK.
  2. Type the following command to enable the 32-bit mode:

    cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1

  3. Type the following command to install the version of ASP.NET 1.1 and to install the script maps at the IIS root and under:

    %SYSTEMROOT%\Microsoft.NET\Framework\v1.1.4322\aspnet_regiis.exe -i

  4. Make sure that the status of ASP.NET version 1.1.4322 is set to Allowed in the Web service extension list in Internet Information Services Manager.

ASP.NET 2.0, 32-bit version

To run the 32-bit version of ASP.NET 2.0, follow these steps:
  1. Click Start, click Run, type cmd, and then click OK.
  2. Type the following command to enable the 32-bit mode:

    cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1

  3. Type the following command to install the version of ASP.NET 2.0 (32-bit) and to install the script maps at the IIS root and under:

    %SYSTEMROOT%\Microsoft.NET\Framework\v2.0.40607\aspnet_regiis.exe -i

  4. Make sure that the status of ASP.NET version 2.0.40607 (32-bit) is set to Allowed in the Web service extension list in Internet Information Services Manager.

ASP.NET 2.0, 64-bit version

To run the 64-bit version of ASP.NET 2.0, follow these steps:
  1. Click Start, click Run, type cmd, and then click OK.
  2. Type the following command to disable the 32-bit mode:

    cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 0

  3. Type the following command to install the version of ASP.NET 2.0 and to install the script maps at the IIS root and under:

    %SYSTEMROOT%\Microsoft.NET\Framework64\v2.0.40607\aspnet_regiis.exe -i

  4. Make sure that the status of ASP.NET version 2.0.40607 is set to Allowed in the Web service extension list in Internet Information Services Manager.
Note The build version of ASP.NET 2.0 may differ depending on what the currently released build version is. These steps are for build version 2.0.40607.

Technical support for Windows x64 editions

Your hardware manufacturer provides technical support and assistance for Microsoft Windows x64 editions. Your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:

http://www.microsoft.com/windowsxp/64bit/default.mspx

For product information about Microsoft Windows Server 2003 x64 editions, visit the following Microsoft Web site:

http://www.microsoft.com/windowsserver2003/64bit/x64/default.mspx

REFERENCES

For more information about 64-bit versions of Windows and the 64-bit version of the .NET Framework, visit the following Microsoft Developer Network (MSDN) Web sites:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnanchor/html/64bitwindows.asp

http://msdn.microsoft.com/netframework/programming/64bit/default.aspx

Modification Type:MajorLast Reviewed:4/20/2006
Keywords:kbhowto kbinfo kbConfig kbWebServer KB894435 kbAudITPRO kbAudDeveloper
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