Adding exposed stack trace:

Code:
   at Lightstreamer.DotNet.Client.ExtConnectionListener.WaitStreamingTimeoutAnswer()
   at Lightstreamer.DotNet.Client.LSClient.OpenConnection(ConnectionInfo info, IConnectionListener listener)
   at Fidelity_Lightstreamer.Source.LightstreamerClient.Start(String pushServerUrl, Int32 phase, ILightstreamerListener listener) in c:\Users\a543617\dev\fidelity-lightstreamer\Fidelity-Lightstreamer\Source\LightstreamerClient.cs:line 44
   at Fidelity_Lightstreamer.App.<Start>d__6.MoveNext() in c:\Users\a543617\dev\fidelity-lightstreamer\Fidelity-Lightstreamer\App.xaml.cs:line 179