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How to configure Red Hat Enterprise Linux system firewall to allow incoming VNC connections?

Solution Verified - Updated 2017-03-08T18:49:36+00:00 -

Issue

Which ports are used by vncserver ?
How to check the port used by vncserver ?
How to configure the firewall (iptables) to allow incoming VNC connections ?
How to restrict VNC Access from specific host or Subnet ?
Facing issue while connecting with VNC server. Getting error: "Timed out waiting for a response from the host computer."
How to restrict VNC Access to a LAN subnet ?
Why I am getting error while trying to connect vnc server: "unable to connect to host: Connection timed out(10060)"?

Environment

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 3

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