Disconnected from server even before the first packet was sent

[r58Playz]

Starting internal server...
2019-06-10 12:51:09 [MainThread] [INFO] Mod loader has identified 1 mods to load
No seed set, generated random seed: 176701563921720149104828281598416444896
Server loop running in thread: Thread-1
Listening on 192.168.56.1 1486
Client PacketReceiver: We've been disconnected by the server
Game mode: creative
2019-06-10 12:51:17 [MainThread] [INFO] Average FPS: 593.075906

Process finished with exit code -1(manual stop in pycharm)

Started with singleplayer. I have changed the code to start the server on Singleplayer, similar to Nebual 's singleplayer server subprocess branch.
Here's the code:
utils.py:

cmd = None

def runserver():
    global cmd
    def run():
        global cmd
        with Popen([sys.executable, 'server.py']) as process:
            while True:
                if cmd == "stop":
                    process.stdin.write('stop')
                    process.stdin.flush()
                    return
                elif 'say' in cmd:
                    process.stdin.write(cmd)
                    process.stdin.flush()
                else:
                    continue
    threading.Thread(target=run).start()

controllers.py:

    def setup(self):
        if G.SINGLEPLAYER:
            try:
                print('Starting internal server...')
                # TODO: create world menu
                G.SAVE_FILENAME = "world"
                try:
                    utils.runserver()
                except:
                    print("Cannot run server with utils.runserver(), starting server with start_server(internal=True)")
                    start_server(internal=True)
                time.sleep(3)
                sock = socket.socket()
                sock.connect((socket.gethostbyname(socket.gethostname()), 1486))
            except socket.error as e:
                print("Socket Error:", e)
                # Otherwise back to the main menu we go
                return False
            except Exception as e:
                print('Unable to start internal server')
                import traceback
                traceback.print_exc()
                return False
        else:
            try:
                # Make sure the address they want to connect to works
                ipport = G.IP_ADDRESS.split(":")
                if len(ipport) == 1: ipport.append(1486)
                sock = socket.socket()
                sock.connect((tuple(ipport)))
            except socket.error as e:
                print("Socket Error:", e)
                # Otherwise back to the main menu we go
                return False

        self.init_gl()

        sky_rotation = -20.0  # -20.0

       # TERRAIN_CHOICE = self.biome_generator.get_biome_type(sector[0], sector[2])
        default_skybox = 'skydome.jpg'
        #if TERRAIN_CHOICE == G.NETHER:
        #    default_skybox = 'skydome_nether.jpg'
        #else:
        #    default_skybox = 'skybox.jpg'


        self.skydome = Skydome(
            G.RESOURCES + default_skybox,
            #'resources/skydome.jpg',
            0.7,
            100.0,
            sky_rotation,
        )

        self.player_ids = {}  # Dict of all players this session, indexes are their ID's [0: first Player on server,]

        self.focus_block = Block(width=1.05, height=1.05)
        self.earth = vec(0.8, 0.8, 0.8, 1.0)
        self.white = vec(1.0, 1.0, 1.0, 1.0)
        self.ambient = vec(1.0, 1.0, 1.0, 1.0)
        self.polished = GLfloat(100.0)
        self.crack_batch = pyglet.graphics.Batch()

        #if G.DISABLE_SAVE and world_exists(G.game_dir, G.SAVE_FILENAME):
        #    open_world(self, G.game_dir, G.SAVE_FILENAME)

        self.world = World()
        self.packetreceiver = PacketReceiver(self.world, self, sock)
        self.world.packetreceiver = self.packetreceiver
        G.CLIENT = self.packetreceiver
        self.packetreceiver.start()

        #Get our position from the server
        self.packetreceiver.request_spawnpos()
        #Since we don't know it yet, lets disable self.update, or we'll load the wrong chunks and fall
        self.update_disabled = self.update
        self.update = lambda dt: None
        #We'll re-enable it when the server tells us where we should be

        self.player = Player(game_mode=G.GAME_MODE)
        print(('Game mode: ' + self.player.game_mode))
        self.item_list = ItemSelector(self, self.player, self.world)
        self.inventory_list = InventorySelector(self, self.player, self.world)
        self.item_list.on_resize(self.window.width, self.window.height)
        self.inventory_list.on_resize(self.window.width, self.window.height)
        self.text_input = TextWidget(self.window, '',
                                     0, 0,
                                     self.window.width,
                                     visible=False,
                                     font_name=G.CHAT_FONT)
        self.text_input.push_handlers(on_toggled=self.on_text_input_toggled, key_released=self.text_input_callback)
        self.chat_box = TextWidget(self.window, '',
                                   0, self.text_input.y + self.text_input.height + 50,
                                   self.window.width // 2, height=min(300, self.window.height // 3),
                                   visible=False, multi_line=True, readonly=True,
                                   font_name=G.CHAT_FONT,
                                   text_color=(255, 255, 255, 255),
                                   background_color=(0, 0, 0, 100),
                                   enable_escape=True)
        self.camera = Camera3D(target=self.player)

        if G.HUD_ENABLED:
            self.label = pyglet.text.Label(
                '', font_name='Arial', font_size=8, x=10, y=self.window.height - 10,
                anchor_x='left', anchor_y='top', color=(255, 255, 255, 255))

        #if G.DEBUG_TEXT_ENABLED:
        #    self.debug_text = TextWidget(self.window, '',
        #                           0, self.window.height - 300,
        #                           500, 300,
        #                           visible=True, multi_line=True, readonly=True,
        #                           font_name='Arial', font_size=10,
        #                           text_color=(255, 255, 255, 255),
        #                           background_color=(0, 0, 0, 0))
        pyglet.clock.schedule_interval_soft(self.world.process_queue,
                                            1.0 / G.MAX_FPS)
        pyglet.clock.schedule_interval_soft(self.world.hide_sectors, 10.0, self.player)
        return True

G.RESOURCES was part of another change which allowed me to set the location of the resources folder. Currently that is set to pyglet.resource.get_settings_path("pyCraft") + "\\resources\\".
By the way, I didn't get any tracebacks.

[r58Playz]

I decided to test my changes, and I got this. I haven't fully implemented cmd yet.

[r58Playz]

I started debugging and discovered there was an error.

ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

[r58Playz]

Weirder output:
Client PacketReceiver:Game mode: creative We've been disconnected by the server