我们从控制器A（服务器端）向控制器B调用API
两者都在IIS中配置为分离站点

站点A -安全配置：

<security>

      <authentication>

        <windowsAuthentication enabled="true">

          <providers>

            <clear />

            <add value="NTLM" />

            <add value="Negotiate" />

          </providers>

        </windowsAuthentication>

        <anonymousAuthentication enabled="false" />

      </authentication>

    </security>

站点B -安全配置：

<security>

                     <authentication>

                           <anonymousAuthentication enabled="false" />

                           <windowsAuthentication enabled="true"/>

                           <basicAuthentication enabled="true"/>

                     </authentication>

</security>

此处为请求代码：`

HttpClientHandler httpClientHandler = new HttpClientHandler()
            {
               Credentials = new CredentialCache() {
                    {
                        httpRequest.RequestUri,
                        "NTLM",
                        CredentialCache.DefaultNetworkCredentials
                    } }
            };        

            var response = await new HttpClient(httpClientHandler).PostAsync(url, data);

'当url为：https://serverName.domain:4444/home/apiName--一切正常
但是当https://VipName.domain:4444/home/apiName--得到401时
谢谢你的帮助！！！
在IIS日志中，我们可以看到用户未通过