Socket hung up in scc-broker

my state serevr is already running

i run
set SCC_STATE_SERVER_HOST=127.0.0.1 && set SCC_BROKER_SERVER_PORT=3300 && node server.js

and i get the error

{ SocketProtocolError: Socket hung up
    at SCClientSocket._onSCClose (D:\arash\socketCluster\scc-broker\node_modules\socketcluster-client\lib\scclientsocket.js:647:15)
    at SCTransport.<anonymous> (D:\arash\socketCluster\scc-broker\node_modules\socketcluster-client\lib\scclientsocket.js:297:12)
    at SCTransport.Emitter.emit (D:\arash\socketCluster\scc-broker\node_modules\component-emitter\index.js:133:20)
    at SCTransport._onClose (D:\arash\socketCluster\scc-broker\node_modules\socketcluster-client\lib\sctransport.js:217:28)
    at WebSocket.SCTransport.wsSocket.onerror (D:\arash\socketCluster\scc-broker\node_modules\socketcluster-client\lib\sctransport.js:81:12)
    at WebSocket.onError (D:\arash\socketCluster\scc-broker\node_modules\ws\lib\event-target.js:128:16)
    at emitOne (events.js:116:13)
    at WebSocket.emit (events.js:211:7)
    at ClientRequest.req.on (D:\arash\socketCluster\scc-broker\node_modules\ws\lib\websocket.js:535:10)
    at emitOne (events.js:116:13)
  name: 'SocketProtocolError',
  message: 'Socket hung up',

Start by reproducing the command from server.js with SCC_STATE_SERVER_HOST=127.0.0.1 and SCC_BROKER_SERVER_PORT=3300, then trace the disconnect through the reported socketcluster-client and ws files. Done means identifying why the broker connection closes and documenting or correcting the cause with a verified rerun.