linux - Cannot connect to google compute engine virtual machine by vnc -

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I have made a calculation engine of a Debian Boiling Virtual Machine in Google, but I am unable to connect it to VNC. Here I have

  1. Installed Gnome and VM
  2. What is the tightvncserver installed in reboot and it has started

    I do Try using a stable IP that I have attached to VM but I am getting the error: "The connection to the host computer was rejected". I thought it was a firewall that was a problem, so I disabled iptable using the following command 

      $ sudo iptables-save & gt; /root/firewall.rules iptables f iptables -x iptables -t net f iptables -t net -x iptables -t slaughter f iptables -t slaughter -X iptables -p input iptables accept -p output forward -p iptables accept ACCEPT   
     And I have made rules in Google firewall to allow port 0-65535 for TCP and udp but it still does not work. Does anyone know how to do this? Thanks in advance   
     
     
     VNC uses the default port 5901. In the 'VNC Server' field, specify IP address and port 5901. Example:  VNC *** Server: 123.123.123.123:5901 Encryption: Let VNC Server Select *** ***   
     Keep in mind that the free version of VNC does not support encryption, it only encrypts your username and password. One thing is also to configure / etc / sysconfig / vncservers file where the user and port that the VNC The server should listen, and make sure it is Not sure how to create an example:  VNCSERVERS = "1: USERNAME"   
      VNCSERVERAR0GS [1] = "- Geometry 800x600 -listen TCP-5901 "

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