1. For the socket server, you must set the virtual machine network connection to 

  Bridged
    Replica Physical Connection Network --> Choose Intel Wifi when on wireless

  (Note that normally you have this network connection set to "NAT", but then you will
  not be seen by the external network)

2. Also for the socket server, you must disable the CentOS 7 firewall

    ps aux | grep firewalld
    sudo systemctl stop firewalld
    ps aux | grep firewalld


3. Now start a listen server ns process

   nc -l 192.168.1.191 63000


4. Now I start a client process on another machine

   nc 192.168.1.191 63000

   (now type stuff and it is transmitted)



5. To open firewall for http / https on port 8080

   sudo firewall-cmd --zone=public --permanent --add-port=8080/tcp
   sudo firewall-cmd --zone=public --permanent --add-service=http
   sudo firewall-cmd --zone=public --permanent --add-service=https
   sudo firewall-cmd --reload