What's wrong with gulp browser-sync plugin?

Question

JavaScript

I use gulp for assembly, I connected the browser-sync plugin for the local server.
At the start of the gulp, it gives the following error . The
tunnel server offline: connect ETIMEDOUT, retry 1s
page does not open automatically. The same issue if you run the server task separately.
At the same time, the rest of the tasks work.
If you make changes in any file and save, gulp crashes and gives the following:

D:\projects\gulp_front\node_modules\browser-sync\lib\browser-sync.js:619
                bs.io.sockets.emit("file:reload", item);
                     ^
TypeError: Cannot read property 'sockets' of undefined
    at D:\projects\gulp_front\node_modules\browser-sync\lib\browser-sync.js:619:22
    at Array.forEach (native)
    at null._onTimeout (D:\projects\gulp_front\node_modules\browser-sync\lib\browser-sync.js:618:29)
    at Timer.listOnTimeout (timers.js:110:15)

Task on browser-sync registered correctly, took from office. documentation.

var config = {
  server: {
    baseDir: "./build"
  },
  tunnel: true,
  host: 'localhost',
  port: 8000,
  logPrefix: "gulp_frontend"
};

// Поднимаем вебсервер
gulp.task('webserver', function () {
  browserSync(config);
});

well, the call of the plugin at the end of the tasks
.pipe(reload({stream: true}));
Who faced, how did you decide?
Tried googling by mistake, didn't find anything useful.

Answer 1

Maybe your port is clogged with something (stupid version, but at least some)?

Answer 2

The port is busy!

Answer 3

Port 3000 is better to use.

Answer 4

tunnel: true,
comment out this line and run.