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WindowsClientCredential.AllowedImpersonationLevel Property

Gets or sets the allowed impersonation level.

Namespace:  System.ServiceModel.Security
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

public TokenImpersonationLevel AllowedImpersonationLevel { get; set; }

This property specifies the impersonation level granted by the client to the server when using Windows SSPI Negotiate authentication. Note that the impersonation level obtained by the server when it impersonates the client token is not solely a function of this setting. It is also a function of the associated privileges and domain settings for the account in which the service is running.

The client must explicitly set the allowed impersonation level using this property.

When the client specifies anonymous impersonation the client always authenticates to the service as anonymous even when no impersonation is performed on the service. This is due to underlying Windows operating system behavior.

For more information about Windows impersonation, go to Impersonating and Reverting. For more information about impersonation using Windows Communication Foundation (WCF), see Delegation and Impersonation with WCF.

The following example shows how to set this property.

// Create a service host.
EndpointAddress ea = new EndpointAddress("http://localhost/Calculator");
WSHttpBinding b = new WSHttpBinding(SecurityMode.Message);
b.Security.Message.ClientCredentialType = MessageCredentialType.Windows;

// Create a client. The code is not shown here. See the WCF samples 
// for an example of the CalculatorClient code.

CalculatorClient cc = new CalculatorClient(b, ea);
// Get a reference to the Windows client credential object.
WindowsClientCredential winCred= cc.ClientCredentials.Windows;
Console.WriteLine("AllowedImpersonationLevel: {0}", 
    winCred.AllowedImpersonationLevel);
Console.WriteLine("AllowNtlm: {0}", winCred.AllowNtlm);
Console.WriteLine("Domain: {0}", winCred.ClientCredential.Domain);

Console.ReadLine();
// Change the AllowedImpersonationLevel.
winCred.AllowedImpersonationLevel = 
    System.Security.Principal.TokenImpersonationLevel.Impersonation;

Console.WriteLine("Changed AllowedImpersonationLevel: {0}", 
    winCred.AllowedImpersonationLevel);
Console.ReadLine();
// Open the calculator and use it. 
//cc.Open(); 
//Console.WriteLine(cc.Add(11, 11)); 

//// Close the client. 
//cc.Close();

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Store apps

Supported in: Windows 8

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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