Any idea why Facebook Provider fails in the below code? - facebook

Question

I implemented OAUTH login with Facebook for my WebAPi service and I am getting the token with the below method:
private static async Task<ExternalLoginData> FromToken(string provider, string accessToken)
{
if (string.IsNullOrEmpty(provider))
return null;
provider = provider.Trim().ToLower();
string verifyTokenEndPoint = "", verifyAppEndpoint = "";
HttpClient client = new HttpClient();
if (provider == ProviderConstants.Facebook)
{
verifyTokenEndPoint = $"https://graph.facebook.com/me?access_token={accessToken}";
verifyAppEndpoint = $"https://graph.facebook.com/app?access_token={accessToken}";
}
else
{
return null;
}
Uri uri = new Uri(verifyTokenEndPoint);
HttpResponseMessage response = await client.GetAsync(uri); <-- exception thrown here
if (response.IsSuccessStatusCode)
{
//not relevant
}
//not relevant
}
The exception is not thrown on local development server on any configuration. But it fails on the live server with the below error.
Any idea why?
Failed when generating token
System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 1.1.1.1:443
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
--- End of inner exception stack trace ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at FishingApp.Controllers.AccountController.<FromToken>d__32.MoveNext() in E:\TeamCity\buildAgent\work\22810208a40a1b66\src\FishingApp\Controllers\AccountController.cs:line 1033
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at FishingApp.Controllers.AccountController.<LoginExternalToken>d__30.MoveNext() in E:\TeamCity\buildAgent\work\22810208a40a1b66\src\FishingApp\Controllers\AccountController.cs:line 865
Additional information: looks like I can't connect to the url because I get this error: Unable to connect to the remote server

Answer 1

I was having the same problem since last 5 days, had seen your question 2 days back but that time i didn't had the answer.
Solution:
May be you are using Smarterasp.net as your hosting provider.
They introduced an additional setting in "Security Tab" , where they are rejecting any internal connection going to graph.facebook.com by default. But if you need this, you have to "Enable" this setting.
Smarterasp Snapshot
Good Luck