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MqttCommunicationException after client connect

See original GitHub issue

Hello,

I am using this library and have tried both v2.4 (nuget and master branch). On my laptop, it works when its connected to WiFi (internet) and ethernet cable (IP camera).

When I test it without WiFi and only IP camera connected via ethernet, MQTT client connects and disconnects immediately with following exception:

2017-11-06 16:54:46.2571 | DEBUG | ### CONNECTED TO SERVER ### 
2017-11-06 16:54:46.2571 | DEBUG | ### DISCONNECTED FROM SERVER ### 
2017-11-06 16:54:46.3551 | ERROR | mqttClient.Connected 
EXCEPTION: MQTTnet.Core.Exceptions.MqttCommunicationException: The client is not connected.
   at MQTTnet.Core.Client.MqttClient.ThrowIfNotConnected()
   at MQTTnet.Core.Client.MqttClient.<SubscribeAsync>d__22.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at UVSS_App.FormUVSS.<<-ctor>b__31_0>d.MoveNext() in D:\Projects

The system where the app is going to be deployed only have ethernet connection without internet. Same issue, connection is established but disconnected immediately.

I have enabled anonymous login on mosquitto service running on same laptop (localhost), but it still does the same thing. I am not binding mqtt server to any IP, it works only on my laptop with I have both WiFi and ethernet cable connected.

What could be the reason for such behavior? any pointers?