Specifies the type of credential to be used when performing client authentication from within a domain using a proxy over HTTP. This attribute is applicable only when the mode attribute of the parent security element is Transport or TransportCredentialsOnly.

Valid values include:

• None: Messages are not secured during transfer.
• Basic: Specifies basic authentication as defined by RFC 2617 – HTTP Authentication: Basic and Digest Authentication.
• Digest: Specifies digest authentication as defined by RFC 2617 – HTTP Authentication: Basic and Digest Authentication.
• Ntlm: Specifies NTLM authentication when possible, and if Windows authentication fails.
• Windows: Specifies Windows integrated authentication.