[Rest API] Get Error The underlying connection was closed: An unexpected error occur

[Tung Do]

Hi all,

At first my apologize if this question is existed somewhere else.

Today I got a problems when use third party library to send request (the HttpClient from .Net Framework)

- for Authentication I use Basic Authentication (username/password)

May I ask why? 

Many Thanks!

Stack Trace:

System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. 

---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. 

---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host

   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)

   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)

   --- End of inner exception stack trace ---

   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)

   at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count)

   at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)

   at System.Net.TlsStream.CallProcessAuthentication(Object state)

   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

   at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)

   at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)

   at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)

   at System.Net.ConnectStream.WriteHeaders(Boolean async)

   --- End of inner exception stack trace ---

   at System.Net.HttpWebRequest.GetResponse()

[Alex Fomin]

Could you plz provide the full example of your code?

Thanks,

Alex, targetprocess team

[Tung Do]

Thanks for your replied.

- Just a simple block of code like this

public static bool CheckForInternetConnection()
        {
            try
            {
                using (var client = new WebClient())
                {
                    using (var stream = client.OpenRead("https://globeteam.tpondemand.com"))
                    {
                        return true;
                    }
                }
            }
            catch(Exception ex)
            {
                return false;
            }
        }

[Tung Do]

I just tried the https://md5.tpondemand.com/ and it request/response successful but https://globeteam.tpondemand.com (our company domain) it can not

On Thursday, June 2, 2016 at 1:11:03 PM UTC+7, Alex Fomin wrote:

[Alex Fomin]

This happens because of enforcing TLS 1.2 on Targetprocess side. You can find more info here:

https://www.targetprocess.com/blog/2016/03/targetprocess-will-start-enforcing-tls-1-2-encryption/

As for your code you need to explicitly enable TLS 1.2 support in your app using the following snippet:

System.Net.ServicePointManager.SecurityProtocol = System.Net.ServicePointManager.SecurityProtocol | System.Net.SecurityProtocolType.Tls12;

Thanks,

Alex, TP Team

[Tung Do]

ha... Its worked :D

You just saved my day

Thanks you very much!!!

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[Muhammad Salman Abdul Wahab]

where to add this line

System.Net.ServicePointManager.SecurityProtocol = System.Net.ServicePointManager.SecurityProtocol | System.Net.SecurityProtocolType.Tls12;

[tsar...@targetprocess.com]

Hi! 

System.Net.ServicePointManager.SecurityProtocol = System.Net.ServicePointManager.SecurityProtocol | System.Net.SecurityProtocolType.Tls12;

code line should be added to your C# solution before any call to Targetprocess REST API.

You can see the examples here:

https://github.com/TargetProcess/RestAPISamples/blob/master/TpRestExample/TpRestExample/Program.cs#L15

https://github.com/TargetProcess/RestAPISamples/blob/master/C%23/RestSharp/RestSharpTest/Program.cs#L16