Call web api with basic authentication always get 401 unauthorized from IIS

Question

Tonight i come search some help about how to call a web api hosted in IIS.

Everything work well in local from visual studio to iis express. But strangely, after publish on my IIS server. I always get 401 unauthorized :'(

Here is the code i use and the settings from my IIS server. I will be very grateful if somebody can help me. Thank you

**

The controller and the function i try to call (with basic authentication attribute)

**

    [HttpGet]
    [ActionName("Get_UserID")]
    [IdentityBasicAuthentication]
    [Authorize]
    public HttpResponseMessage Get_UserID(string userName)
    {
        HttpResponseMessage res = new HttpResponseMessage(HttpStatusCode.Created);
        try
        {
            var user = Membership.GetUser(userName, false);
            if (user != null)
            {
                res = Request.CreateResponse(HttpStatusCode.OK, (Guid)user.ProviderUserKey);
            }
            else
            {
                res = Request.CreateResponse(HttpStatusCode.ExpectationFailed);
                res.Content = new StringContent("Error");
                res.ReasonPhrase = "UserName not find in the database";
            }
        }
        catch (Exception exc)
        {
            //Set the response message as an exception
            res = Request.CreateResponse(HttpStatusCode.InternalServerError);
            res.Content = new StringContent("Exception");
            res.ReasonPhrase = exc.Message;
        }
        return res;
    }

**

Client side - How i call the web api and build my httpClient

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    public static async Task<HttpResponseMessage> RequestStart(string requestUrl, string webApiUrlBase = Globals.WebApi_Url, bool IsAuthenticateMemberRequest = false)
    {
        if (webApiUrlBase == null)
        {
            webApiUrlBase = Globals.WebApi_Url;
        }
        var response = new HttpResponseMessage(HttpStatusCode.Created);

        using (var client = new HttpClient())
        {
            if (IsAuthenticateMemberRequest)
            {
                string strToEncode = ApplicationData.Current.LocalSettings.Values["userName"].ToString() + ":" + ApplicationData.Current.LocalSettings.Values["password"].ToString();
                var authenticationBytes = Encoding.ASCII.GetBytes(strToEncode);

                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
                Convert.ToBase64String(authenticationBytes));
            }
            client.BaseAddress = new Uri(Globals.WebApi_Url);
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            response = await client.GetAsync(requestUrl);
        }

        return response;
    }

**

IIS Configuration (appPool => NetworkServices - integrate)

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**

Fiddler Debug

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Answer 1

Finally after search many times , many houres by myself. I find the solution. We should never enable Basic Authentication.... I know it's weird ^^ But if you want to use your custom basic authentication. Just disabled the Basic Authentication on IIS and everything goes well.