I am getting a 401 error(Access denied due to invalid credentials), when working with webapi

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I am trying to consume the webapi file which is on server with the console application on my machine, We have windows authentication on.
I would really appreciate if someone could help as I am trying since yesterday and searching for the answer and tried different methods too.

C#

client.BaseAddress = new Uri(baseurl);
           client.DefaultRequestHeaders.Accept.Clear();
           client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
           int anId = 100;
           HttpResponseMessage response;
           string serviceUrl = "api/contacts";

           //var Id = "{'Id':'0001'}";

           var anContact = new Contact()
           {
               Id=600,
               ContactName = "Nick",
               ContactPhNo = "789-665-345"
           };

           

           // 2. Get all employees.

           Console.WriteLine("2. Get All Employee by sending GET {0}/{1} \r\n", baseurl, serviceUrl);

           response = client.GetAsync(serviceUrl).Result;

Posted 23-Dec-15 6:08am

swapsun

Updated 23-Dec-15 6:20am

v3

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ZurdoDev 23-Dec-15 12:41pm

Based on the error, it would seem you know what the problem is, doesn't it? You need to authenticate or change the page your trying to post to to allow anonymous.

swapsun 23-Dec-15 14:04pm

I tried doing that too.

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Mathi Mani · Accepted Answer · 2015-12-23T06:42:00

Solution 1

Hi,

In order to access a WebAPI using windows authentication, you have to create a HttpClientHandler and set the credentials in it. Then, this HttpClientHandler object has to be passed to the HttpClient.

Please refer my technical tip on this for detailed explanation.

Authenticate WebAPIs with Basic and Windows Authentication[^]

Hope this helps. Happy learning!!

Posted 23-Dec-15 6:42am

Mathi Mani

Comments

swapsun 23-Dec-15 13:34pm

I think that helped, Thanks a lot, but now I am stuck on 404 error.

HttpClientHandler authtHandler = new HttpClientHandler()
{
Credentials = CredentialCache.DefaultNetworkCredentials
};
using (HttpClient confClient = new HttpClient(authtHandler))
{

confClient.BaseAddress = new Uri(baseurl);
confClient.DefaultRequestHeaders.Accept.Clear();
confClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

response = confClient.GetAsync(serviceUrl).Result;

if (response.IsSuccessStatusCode)
{

Mathi Mani 23-Dec-15 14:27pm

Please check whether the URI you are using is valid, by directly putting it in the address bar of the browser.