PRB: "HTTP/1.1 500 Internal Server Error" Error Message When You Have Multiple ASP.NET Applications That Use the Same Application Pool with Different Script-Mapped Versions

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SYMPTOMS

When you try to create a new Microsoft ASP.NET 1.1 application after you change the script mapping of the existing ASP.NET 1.1 Web application to ASP.NET 1.0 on a Microsoft Windows Server 2003-based computer, you may receive the following error message:

The Web server reported the following error when attempting to create or open the Web project located at the following URL: 'http://localhost/822319ev1'. 'HTTP/1.1 500 Internal Server Error'.

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CAUSE

This issue occurs because Windows Server 2003 does not allow two versions of ASP.NET to run in the same application pool.

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WORKAROUND

To work around the problem, do one of the following:

Restart the IIS before you create a new ASP.NET 1.1 application. At the command prompt, type the following command:
iisreset
-or-
Create an ASP.NET application in a separate application pool. Create the script-mapped application (ASP.NET 1.0) in a separate application pool -- for example, in the ScriptMapappPool application pool. Then, create a new ASP.NET 1.1 application in an application pool other than ScriptMapappPool. For more information about how to create an application pool, visit the following Microsoft Web site:
Configuring Application Pools
http://msdn2.microsoft.com/en-us/library/1kdfe21k(VS.80).aspx (http://msdn2.microsoft.com/en-us/library/1kdfe21k(VS.80).aspx)

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STATUS

This behavior is by design.

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MORE INFORMATION

Create a New ASP.NET 1.1 Web Application

In Windows Server 2003, start Microsoft Visual Studio .NET 2003.
Create a new ASP.NET Web application project by using Microsoft Visual Basic .NET or Microsoft Visual C# .NET. Name the project as ScriptMap10. By default, WebForm1.aspx is created.
On the Build menu, click Build Solution.
Close the Visual Studio IDE.

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Configure the Script Map of the Application to ASP.NET 1.0

Click Start, and then click Run.
In the Open box, type cmd, and then click OK.
At a command prompt, locate the following directory path:
%windir%\Microsoft.NET\Framework\v1.0.3705
To configure the application to ASP.NET 1.0 in Microsoft Internet Information Services (IIS), type the following command:
aspnet_regiis -s w3svc/1/root/ScriptMapTest
To view the application, type the following URL in Microsoft Internet Explorer:
http://localhost/ScriptMapTest/WebForm1.aspx

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Create a New ASP NET 1.1 Application

Start Visual Studio .NET 2003.
On the File menu, point to New, and then click Project.
Type http://localhost/AppTest, and then click OK.

You may notice the error that is described in the "Symptoms" section of this article.

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REFERENCES

For more information about application pools, visit the following Microsoft Web site:

Configuring Application Pools
http://technet2.microsoft.com/WindowsServer/en/library/c7f09f1c-b238-42a4-9d57-c5732485eba91033.mspx?mfr=true (http://technet2.microsoft.com/WindowsServer/en/library/c7f09f1c-b238-42a4-9d57-c5732485eba91033.mspx?mfr=true)

For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

816782 (http://support.microsoft.com/kb/816782/ ) HOW TO: Configure Different Versions of an ASP.NET Application Running on the Same Web Server

817265 (http://support.microsoft.com/kb/817265/ ) HOW TO: Set Up Multiple User Debugging in Semi-Isolated Mode Under Internet Information Services (IIS) 6.0

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