HTML5 Multiplayer

The dedicated development/shipping server crashes when client tries to connect to port 8889.
Firefox (47.0 64-bit) error:
“The connection to ws://149.56..:8889/ was interrupted while the page was loading.”
NOTE: The normal Win64 client network cannot/wont even initiate Websocket communications!

Normal building of server/client with Visual Studio 2015 works from github source when using default networking.

Instructions used:

Detailed Development Server Error:

[2016.06.20-07.32.45:601][208]LogNet: NotifyAcceptingConnection: Server TheMeetingRoom accept
[2016.06.20-07.32.45:797][208]PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent)
[2016.06.20-07.32.46:011][208]LogNet: NotifyAcceptedConnection: Name: TheMeetingRoom, TimeStamp: 06/20/16 10:32:46, [UNetConnection] RemoteAddr: dsl-hkibra****-.dhcp.inet.fi, Name: WebSocketConnection_0, Driver: GameNetDriver WebSocketNetDriver_0, IsServer: YES, PC: NULL, Owner: NULL
[2016.06.20-07.32.46:011][208]LogNet: AddClientConnection: Added client connection: [UNetConnection] RemoteAddr: dsl-hkibra
-
****.dhcp.inet.fi, Name: WebSocketConnection_0, Driver: GameNetDriver WebSocketNetDriver_0, IsServer: YES, PC: NULL, Owner: NULL
[2016.06.20-07.32.46:020][208]LogNetSerialization:Error: FBitReader::SetOverflowed() called
[2016.06.20-07.32.46:042][208]LogWindows: Windows GetLastError: The operation completed successfully. (0)
[2016.06.20-07.32.47:226][208]LogWindows:Error: === Critical error: ===
LowLevelFatalError [File:C:\UnrealEngine-release\Engine\Source\Runtime\Engine\Classes\Engine/NetConnection.h] [Line: 561]
Pure virtual not implemented (UNetConnection::RemoteAddressToString)

[2016.06.20-07.32.47:237][208]LogExit: Executing StaticShutdownAfterError
[2016.06.20-07.32.47:261][208]LogWindows: FPlatformMisc::RequestExit(1)
[2016.06.20-07.32.47:262][208]Log file closed, 06/20/16 10:32:47