how to force client(winform) application to use NTLM when calling web services

I have a winform application calling web services hosted in IIS, by default, the client app will use Kerberose for auth开发者_开发问答entication to IIS, and it failed for some reasons。 But the same app works fine at another PC(with different user login), and I found it is using NTLM by checking the IIS server event log.

is there anyway we can change the client app(winform) authentication type?

Thanks in advance

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As per the HttpWebRequest.Credentials documentation, to restrict the request authentication to particular methods only, you need to create a new instance of the CredentialCache class, bind your credentials to the desired authentication methods and set it to the Credentials property.

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Have u tried hosting the web services with Windows authentication? Then the consuming application must also use the same authentication to access the web service.