In-depth Analysis and Solutions for ASP.NET HTTP Error 500.19 with Error Code 0x8007000d

Error Background and Problem Description

During the deployment of ASP.NET web applications, HTTP Error 500.19 is a frequent internal server error, where error code 0x8007000d typically indicates configuration issues. As reported by users, this error occurs on Windows 7 systems, while the same Web.config file functions correctly in a Windows 8 development environment. This highlights the impact of environmental differences on configuration dependencies.

Core Cause of Error Code 0x8007000d

The root cause of error code 0x8007000d is the absence or improper installation of the URL Rewrite Module in IIS. When the Web.config file references this module and it is not installed on the server, IIS fails to parse the configuration, leading to XML parsing failures. Although Microsoft documentation mentions malformed XML elements in ApplicationHost.config or Web.config, in practice, module dependency issues are more common.

Diagnostic and Verification Steps

To confirm this error, first check the module list in IIS Manager. On Windows 7, the URL Rewrite Module may not be installed by default. Run the following command to verify module status:

%windir%\system32\inetsrv\appcmd.exe list modules

If the output does not include "UrlRewriteModule", installation is required. Additionally, inspect the Web.config for configurations such as:

<system.webServer>
    <rewrite>
        <rules>
            <rule name="RedirectRule" stopProcessing="true">
                <match url=".*" />
                <action type="Redirect" url="http://example.com" />
            </rule>
        </rules>
    </rewrite>
</system.webServer>

This configuration depends on the URL Rewrite Module; if missing, it triggers the error.

Solution Implementation

The primary solution is to install the URL Rewrite Module. It is recommended to use the Microsoft Web Platform Installer for this purpose, with steps as follows:

1. Download and run the Web Platform Installer.
2. Search for "URL Rewrite Module 2.0" and install it.
3. Restart the IIS service to ensure the module is loaded.

After installation, revisit the application, and the error should resolve. If issues persist, check for other dependencies, such as custom handlers or modules. For example, in the user-provided Web.config, the handlers section references ReportViewerWebControlHandler, requiring that related assemblies are deployed.

Prevention and Best Practices

To avoid similar errors, conduct an environmental audit before deployment:

• Use tools like aspnet_regiis -i to register ASP.NET.
• Verify application pool settings to ensure the correct .NET version is used.
• Add redundancy checks in Web.config, such as using <validation validateIntegratedModeConfiguration="false" /> to ignore integrated mode configuration errors, though this is only a temporary measure.

In summary, HTTP Error 500.19 with error code 0x8007000d is often caused by missing modules and can be effectively resolved through systematic diagnosis and module installation.