“The authentication or decryption has failed.” Exception when connecting socket in android

[diogod3]

I'm writing an app using C# and PCL to runs in android, ios and windows and in that app I'm using sockets for pcl to create and connect to a TCP socket.

This is the code to create and connect the socket:

  _bufferSize = 1024 * 1000 * 2;
  _client = new TcpSocketClient(_bufferSize);

   await _client.ConnectAsync(_hostName, _port, true); 

This is inside an async task that is called when initializing the app.

In windows it works fine, however in android sometimes it works, sometimes it doesn't and when it doesn't I keep getting this exception "The authentication or decryption has failed."

{System.IO.IOException: The authentication or decryption has failed. ---> 
	System.IO.IOException: Error while sending TLS Alert (Fatal:InternalError): 
		System.NotSupportedException: Cannot write to a BufferedStream while the read buffer is not empty if the underlying stream is not seekable. 
		Ensure that the stream underlying this BufferedStream can seek or avoid interleaving read and write operations on this BufferedStream.  
			at System.IO.BufferedStream.ClearReadBufferBeforeWrite () [0x00032] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/io/bufferedstream.cs:432   
			at System.IO.BufferedStream.BeginWrite (System.Byte[] buffer, System.Int32 offset, System.Int32 count, System.AsyncCallback callback, System.Object state) [0x000ab] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/io/bufferedstream.cs:1022   
			at Mono.Security.Protocol.Tls.SslStreamBase.InternalBeginWrite (Mono.Security.Protocol.Tls.SslStreamBase+InternalAsyncResult asyncResult) [0x00031] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/SslStreamBase.cs:782  ---> 
			System.NotSupportedException: Cannot write to a BufferedStream while the read buffer is not empty if the underlying stream is not seekable. Ensure that the stream underlying this BufferedStream can seek or avoid interleaving read and write operations on this BufferedStream.  
				at System.IO.BufferedStream.ClearReadBufferBeforeWrite () [0x00032] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/io/bufferedstream.cs:432   
				at System.IO.BufferedStream.BeginWrite (System.Byte[] buffer, System.Int32 offset, System.Int32 count, System.AsyncCallback callback, System.Object state) [0x000ab] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/io/bufferedstream.cs:1022   
				at Mono.Security.Protocol.Tls.RecordProtocol.BeginSendRecord (Mono.Security.Protocol.Tls.ContentType contentType, System.Byte[] recordData, System.AsyncCallback callback, System.Object state) [0x00026] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/RecordProtocol.cs:765   
				at Mono.Security.Protocol.Tls.RecordProtocol.SendRecord (Mono.Security.Protocol.Tls.ContentType contentType, System.Byte[] recordData) [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/RecordProtocol.cs:786   
				at Mono.Security.Protocol.Tls.RecordProtocol.SendAlert (Mono.Security.Protocol.Tls.Alert alert) [0x00027] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/RecordProtocol.cs:633   
				at Mono.Security.Protocol.Tls.RecordProtocol.SendAlert (System.Exception& ex) [0x00021] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/RecordProtocol.cs:598    
				--- End of inner exception stack trace ---   
			--- End of inner exception stack trace ---  
			at Mono.Security.Protocol.Tls.SslStreamBase.EndRead (System.IAsyncResult asyncResult) [0x00051] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/SslStreamBase.cs:883   
			at Mono.Net.Security.Private.LegacySslStream.EndAuthenticateAsClient (System.IAsyncResult asyncResult) [0x00011] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System/Mono.Net.Security/LegacySslStream.cs:475   
			at Mono.Net.Security.Private.LegacySslStream.AuthenticateAsClient (System.String targetHost, System.Security.Cryptography.X509Certificates.X509CertificateCollection clientCertificates, System.Security.Authentication.SslProtocols enabledSslProtocols, System.Boolean checkCertificateRevocation) [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System/Mono.Net.Security/LegacySslStream.cs:445   
			at Mono.Net.Security.Private.MonoSslStreamImpl.AuthenticateAsClient (System.String targetHost, System.Security.Cryptography.X509Certificates.X509CertificateCollection clientCertificates, System.Security.Authentication.SslProtocols enabledSslProtocols, System.Boolean checkCertificateRevocation) [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System/Mono.Net.Security/MonoSslStreamImpl.cs:77   
			at System.Net.Security.SslStream.AuthenticateAsClient (System.String targetHost, System.Security.Cryptography.X509Certificates.X509CertificateCollection clientCertificates, System.Security.Authentication.SslProtocols enabledSslProtocols, System.Boolean checkCertificateRevocation) [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System/System.Net.Security/SslStream.cs:147   
			at Sockets.Plugin.TcpSocketClient+<ConnectAsync>d__7.MoveNext () [0x0022e] in C:\Users\rdavis\Source\Repos\sockets-for-pcl-for_real\Sockets\Sockets.Implementation.NET\TcpSocketClient.cs:101 
		--- End of stack trace from previous location where exception was thrown ---  
		at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143   
		at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187   
		at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156   
		at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128   
		at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113   
		at BetAPI.ESAService.Client+<ConnectSocket>d__73.MoveNext () [0x000a4]  }

I've looked for similar issues but I didn't find anything. Does anyone know what the problem is?

[rdavisau]

Hi - sorry about the delayed response. The stacktrace is interesting and I've never encountered this one before. Can you try using a zero buffer size? How frequently does the error occur? Can it occur and/or not occur on the same device? Between or within the same launch instance, etc. ?

[diogod3]

Hi, actually earlier this week I tried using a zero buffer size and it solved my problem. So I guess the problem had something to do with the buffer size I was using.

The error didn't have a constant frequency, sometimes it would occur several times in a row but other times it worked fine several times in a row too. Yes it would occur and not occur on the same device. After the error occur one time I had to reset the app because the socket would be throwing the same error every time I tried to connect.