Conexão falhou: Connection refused

Recebi a mensagem de "Connection refused" ao final do vídeo 5.06. Revisei os códigos em não encontrei nenhum erro.

VAGRANTFILE

$script_mysql = <<-SCRIPT
   echo ----------------------------UPDATE APT-GET
   apt-get update && \
   echo ----------------------------INSTALL MYSQL
   apt-get install -y mysql-server-5.7 && \
   echo ----------------------------CONFIG MYSQL
   mysql -e "create user 'phpuser'@'%' identified by 'pass';"
   echo ----------------------------END SCRIPT
SCRIPT

Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/bionic64"

  config.vm.define "mysqldb" do |mysql|
    #-----------------------INTERFACE DE REDE
    #mysql.vm.network "private_network", type: "dhcp"
    mysql.vm.network "public_network", ip: "192.168.0.100"
    #---------------------COMANDOS BASH/SHELL
    mysql.vm.provision "shell",
      inline: "cat /configs/id_bionic.pub >> .ssh/authorized_keys" # incrementa
    mysql.vm.provision "shell", inline: $script_mysql
    mysql.vm.provision "shell",
      inline: "cat /configs/mysqld.cnf > /etc/mysql/mysql.conf.d/mysqld.cnf" #sobrescreve
    mysql.vm.provision "shell", inline: "service mysql restart"
    #-----------------SINCRONIZAÇÃO E ACESSO A PASTAS HOST-GUEST
    mysql.vm.synced_folder "./configs", "/configs" # pasta VM, pasta host - A Referência é a pasta do vagrantfile
    mysql.vm.synced_folder ".", "/vagrant", disabled: true   #Evita acesso ao vagrantfile
  end

  config.vm.define "phpweb" do |phpweb|
    phpweb.vm.network "forwarded_port", guest: 8888, host: 8888
    phpweb.vm.network "public_network", ip: "192.168.0.101"

    phpweb.vm.provision "shell",
      inline: "apt-get update && apt-get install -y puppet"

    phpweb.vm.provision "puppet" do |puppet|
      puppet.manifests_path = "./configs/manifests"
      puppet.manifest_file = "phpweb.pp"
    end
  end
end

PHPWEB.PP

exec { 'apt-update':
  command => '/usr/bin/apt-get update'
}

package { ['php7.2' ,'php7.2-mysql'] :
  require => Exec['apt-update'],
  ensure => installed,
}

exec { 'run-php7':
  require => Package['php7.2'],
  command => '/usr/bin/php -S 0.0.0.0:8888 -t /vagrant/src &'

}

INDEX.PHP

<?php
echo "Testando conexao <br /> <br />";
$servername = "192.168.0.101";
$username = "phpuser";
$password = "pass";

// Create connection
$conn = new mysqli($servername, $username, $password);

// Check connection
if ($conn->connect_error) {
    die("Conexão falhou: " . $conn->connect_error);
}
echo "Connetado com sucesso";
?>