`<windows>` of `<clientCredentials>` Element

Specifies the settings for a Windows credential to be used to represent the client.

<configuration>
  <system.serviceModel>
    <behaviors>
      <endpointBehaviors>
        <behavior>
          <clientCredentials>
            <windows>

Syntax

<windows allowedImpersonationLevel="Identification/Impersonation/Delegation/Anonymous/None"
         allowNtlm="Boolean" />

Attributes and Elements

The following sections describe attributes, child elements, and parent elements.

Attributes

Attribute Description

allowedImpersonationLevel Sets the impersonation preference that the client communicates to the server. The impersonation mode that the client selects is not enforced on the server. Valid values include the following:

- Identification: The server can get the identity and privileges of the client, but cannot impersonate the client.
- Impersonation: The server can impersonate the client's security context on the local system.
- Delegation: The server can impersonate the client's security context on remote systems.
- Anonymous: The server cannot impersonate or identify the client.
- None: An impersonation level is not assigned.

The default is Identification. This attribute is of type TokenImpersonationLevel.

allowNtlm Setting this property to true allows authentication to downgrade to NTLM if Kerberos is not available.

Setting this property to false causes Windows Communication Foundation (WCF) to make a best-effort to throw an exception if NTLM is used. Note that setting this property to false may not prevent NTLM credentials from being sent over the wire.

Attribute	Description
`allowedImpersonationLevel`	Sets the impersonation preference that the client communicates to the server. The impersonation mode that the client selects is not enforced on the server. Valid values include the following: - Identification: The server can get the identity and privileges of the client, but cannot impersonate the client. - Impersonation: The server can impersonate the client's security context on the local system. - Delegation: The server can impersonate the client's security context on remote systems. - Anonymous: The server cannot impersonate or identify the client. - None: An impersonation level is not assigned. The default is Identification. This attribute is of type TokenImpersonationLevel.
`allowNtlm`	Setting this property to `true` allows authentication to downgrade to NTLM if Kerberos is not available. Setting this property to `false` causes Windows Communication Foundation (WCF) to make a best-effort to throw an exception if NTLM is used. Note that setting this property to `false` may not prevent NTLM credentials from being sent over the wire.

Child Elements

None.

Parent Elements

Element	Description
<clientCredentials>	Specifies the credentials used to authenticate the client to the service.

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Last updated on 2021-09-15