3.4.5. Installing and Configuring a VNC Viewer

Oracle VM Manager uses a secure tunnel to protect the virtual machine console (remote connection utility) data across the network. Oracle VM Manager does not communicate directly with the VNC client, but rather connects via an SSH-encrypted tunnel on port 69xx (where xx is based on the guest to which it is connecting).

Any firewall between the client and Oracle VM Manager needs port 15901 to be open. Any firewall between the Oracle VM Manager and the Oracle VM Servers needs ports 6900 and above open; one port for each virtual machine on an Oracle VM Server. For example, if you have 100 virtual machines on an Oracle VM Server, you should open ports 6900-6999 (100 ports) on any firewall between the Oracle VM Server and Oracle VM Manager.

To connect to a virtual machine's console in Oracle VM Manager, you should have a VNC viewer installed somewhere in your environment, either:

The virtual machine console feature uses the client instance of a VNC viewer, if one exists, to connect to a virtual machine's console. If a VNC viewer is not found on the client computer, a request is sent to the Oracle VM Manager host computer to display the VNC viewer.

It is preferred that you install either TightVNC on the Oracle VM Manager host computer. You can get the latest TightVNC package from:


Install TightVNC with the command:

# rpm -ivh tightvnc-java-version.noarch.rpm

On the client computer you use to connect to Oracle VM Manager it is recommended that you install RealVNC. Oracle recommends RealVNC on the client computer as it renders quickly, has better keyboard support, and has less mouse control issues compared to other VNC clients. The RAS proxy applet used to view the screen or console of a virtual machine looks for RealVNC by default. If you have multiple VNC viewers on your client computer, you can configure which one is used from the virtual machine console in Oracle VM Manager. See Connecting to a Virtual Machine for more information on using and configuring the VNC client.

If you are using a Linux-based operating system on your client computer, you can also install TightVNC as above on your client computer and it is automatically discovered when you connect to a virtual machine using the console feature in Oracle VM Manager.