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MachineKeySection Class

Defines the configuration settings that control the key generation and algorithms that are used in encryption, decryption, and media access control (MAC) operations in Windows Forms authentication, view-state validation, and session-state application isolation. This class cannot be inherited.

Namespace: System.Web.Configuration
Assembly: System.Web (in system.web.dll)

public ref class MachineKeySection sealed : public ConfigurationSection
public final class MachineKeySection extends ConfigurationSection
public final class MachineKeySection extends ConfigurationSection
Not applicable.

The MachineKeySection class provides a way to programmatically access and modify the content of the <MachineKey> section in the configuration file. The <MachineKey> section can be configured at the machine (Machine.config) or application (Web.config) level and controls the keys and algorithms that are used for Windows Forms authentication, view-state validation, and session-state application isolation. For any of these features to work across a network of Web servers (a Web farm), the <MachineKey> attributes must be configured explicitly and identically with a valid key value. The "AutoGenerate" value does not work for Web farms, because it relies on a cryptographically random secret, which is persisted using machine-local protection and will not be coherent across more than one computer.

Notes to Implementers: If it is required to specify keys in this configuration section, as is often required in Web-farm scenarios, it is recommended that you encrypt this section by using protected configuration.

The example in this section demonstrates how to specify values declaratively for several attributes of the machineKey Element (ASP.NET Settings Schema) section, which can also be accessed as members of the MachineKeySection class.

The following example from a configuration file shows how to specify values declaratively for the machineKey Element (ASP.NET Settings Schema) section.

<system.web>
  <machineKey validationKey="AutoGenerate,IsolateApps" 
    decryptionKey="AutoGenerate,IsolateApps" 
    validation="SHA1"/>
</system.web>

The following example demonstrates how to use the MachineKeySection class.

No code example is currently available or this language may not be supported.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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