SocketException (0x274c) while accessing API via System.Net.Http.HttpClient

Question

I am developing an ASP.NET MVC application. There I consume an API service via System.Net.Http.HttpClient. Here is the controller that performs the job

        private readonly HttpClient _client;
        public HomeController()
        {
          _client = new HttpClient()
        }

        public async Task<ActionResult> Index(SearchParam searchParam)
        {
            // API Initialization
            _client.DefaultRequestHeaders.Clear();
            _client.BaseAddress = new Uri(Uri);
            _client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            // API Consumption By HttpClinet
            var url = _searchService.GetApiQueryParams(searchParam);
            var response = await _client.GetAsync(url);

            var jsonString = await response.Content.ReadAsStringAsync();
            var rootobject = JsonConvert.DeserializeObject<Response.Rootobject>(jsonString);

            if (response.StatusCode == HttpStatusCode.OK)
            {
                var searchResults = _searchService.GetSearchResults(rootobject, searchParam);
                return View("SearchResult", searchResults);
            }

            ModelState.AddModelError(string.Empty, "Sorry some internal error occur !");
            return View("SearchResult");
        }

This works fine on my Local Server as well as on an IIS Server. But when I publish the application to a different hosting Server and try to consume the API it shows this error.

I have found two similar issue. Please have a look at these

From the first issue, I didn't get the "load balancer to the server". And from the second issue when I add the solution in the Web.config it shows an error for proxyaddress="http://proxyserver" which make sense.

Now I am badly in need of a solution to this problem. I am not good at questing, so please feel free to suggest or correct any error.

Did you try to telnet the API server IP/Port from the place where you have hosted your app? It could be some firewall issues if you are not able to connect using telnet. — Thangadurai
– Thangadurai, Commented Jun 2, 2018 at 9:28

ramzan ali · Accepted Answer · 2018-06-11 08:07:05Z

1

At last, the problem solved. Mentioning the second issue I emailed the problem to the Hosting provider, they provide a system.net configuration. Using this system.net configuration in Web.config solved the issue.

<system.net>
 <defaultProxy>
  <proxy
    usesystemdefault = "false"
    bypassonlocal="false"
    proxyaddress="http://hosting-provided-proxyaddress-here"
  />
 </defaultProxy>
</system.net>

answered Jun 11, 2018 at 8:07

ramzan ali

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