401 来自一台设备的未经授权的错误，但来自另一台设备的成功

Question

I am creating an application in Xamarin Forms for iOS and android. In VS, the test code works perfectly every time, with a response code of "OK" (200). However, in another little project which will work alongside the mobile apps (written in windows forms (.NET)), the EXACT same code, username, password, url, returns error "Unauthorised" (401).

The url in question that doesn't work is http://192.168.8.193/get.cgi?id=26&sid=255 . BUT another url of similar function DOES work: http://-Hidden-/get.cgi?id=26&sid=255 .

public static async Task<string> TestConnection(string url, string username, string password)
        {
            url = url + PanelCommands.GET_URL + PanelCommands.CONNECT_URL;

            if (GetInternetConnectivity())
            { 

                NetworkCredential credential = new NetworkCredential { UserName = username, Password = password };

                HttpClientHandler handler = new HttpClientHandler { Credentials = credential };
                HttpClient client = new HttpClient(handler);
                client.Timeout = new TimeSpan(0, 0, 10);                

                try
                {
                    var response = await client.GetAsync(url).ConfigureAwait(false);

                    return response.StatusCode.ToString();
                }
                catch (Exception e)
                {
                    Debug.WriteLine(e);
                    return "Failed";
                }
            }

I have tried pre-authenticating, adding authentication headers, etc. But nothing seems to work.

Any help would be appreciated,

Thanks!

Answer 1

The URL in question that doesn't work is http://192.168.8.193/get.cgi?id=26&sid=255 .

First of all, I think you are missing the port in your URL. It should be something like http://192.168.8.193:5000/get.cgi?id=26&sid=255 .

Edit: This is something I got wrong. You can perfectly have a URL without a specific port.

Secondly, your firewall may be blocking the connection between your projects, if they are running in different devices. You can try adding an inbound rule following this article for Windows 10 (it is somewhat similar in other versions of windows as well).

Answer 2

Sacked this off. Rewrote the project in Xamarin UWP. Worked perfectly first time.