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== Firewall Configuration ==
If you want to use the insecure access methods (and I still strongly recommend you use the secure method) and are certain that remote access will always take place within the context of a secure internal local area network then it is important to be aware that you must configure the CentOS RHEL firewall to allow this to happen. By default, the CentOS RHEL firewall is both enabled and configured to block insecure remote desktop access. Before proceeding, therefore, it is necessary to allow VNC traffic to pass uneventfully through the firewall. Before performing this task it is important to know that the remote desktop system uses TCP/IP port 5900 to access the screen 0 (the main screen of your desktop) for communicating between the client and server systems. We must, therefore, configure the firewall to allow traffic on this port. To achieve this simply perform the following steps:
1. Start the Firewall configuration tool (''System -> Administration -> Security Level and Firewall'') and enter your root password when prompted to do so.
In the examples so far we have only covered remote access to the primary desktop. By primary desktop we mean the desktop you see when you sit at your computer and turn on the monitor. While this is fine for a single user system we should not lose sight of the fact that Linux is a multi-user operating system and it will often be necessary for more than one person to have remote desktop access at a time. While it might be fun to watch everyone fight over the mouse pointer as they share the same desktop it is clear that not much work will get done. The solution to this is to run multiple desktops for the users to connect to.
New desktop environments are created using the vncserver utility which should also have been installed by default when you installed CentOSRHEL. Installation may, however, be performed as follows:
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