AuthenticationLevel Property

WebRequest.AuthenticationLevel Property


Gets or sets values indicating the level of authentication and impersonation used for this request.

Namespace:   System.Net
Assembly:  System (in System.dll)

public AuthenticationLevel AuthenticationLevel { get; set; }

Property Value

Type: System.Net.Security.AuthenticationLevel

A bitwise combination of the AuthenticationLevel values. The default value is MutualAuthRequested.

In mutual authentication, both the client and server present credentials to establish their identity. The MutualAuthRequired and MutualAuthRequested values are relevant for Kerberos authentication. Kerberos authentication can be supported directly, or can be used if the Negotiate security protocol is used to select the actual security protocol. For more information about authentication protocols, see Internet Authentication.

To determine whether mutual authentication occurred, check the WebResponse.IsMutuallyAuthenticated property.

If you specify the MutualAuthRequired authentication flag value and mutual authentication does not occur, your application will receive an IOException with a ProtocolViolationException inner exception indicating that mutual authentication failed.

The following code example sets the value of this property.

// The following example uses the System, System.Net, 
// and System.IO namespaces.

public static void RequestMutualAuth(Uri resource)
    // Create a new HttpWebRequest object for the specified resource.
    WebRequest request=(WebRequest) WebRequest.Create(resource);
    // Request mutual authentication.
   request.AuthenticationLevel = AuthenticationLevel.MutualAuthRequested;
    // Supply client credentials.
    request.Credentials = CredentialCache.DefaultCredentials;
    HttpWebResponse response = (HttpWebResponse) request.GetResponse();
    // Determine whether mutual authentication was used.
    Console.WriteLine("Is mutually authenticated? {0}", response.IsMutuallyAuthenticated);
    // Read and display the response.
    Stream streamResponse = response.GetResponseStream();
    StreamReader streamRead = new StreamReader(streamResponse);
    string responseString = streamRead.ReadToEnd();
    // Close the stream objects.
    // Release the HttpWebResponse.

.NET Framework
Available since 2.0
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