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If it has not happened yet, Xephyr must be installed on the remote Linux system where the Charon-SSP Manager will be used to start the X-server.

Use the following commands command to install the software on a Linux system with RPM based packet management:

# yum install xorg-x11-server-Xephyr

Use the following commands to install the software on a Linux system with Debian package management:

# apt-get update
# apt-get install xserver-xephyr

Firewall Considerations

The Xephyr nested X-server listens for connections on port range 6001-6100 depending on the X11 Server configuration in Charon-SSP Manager. The configured ports must be allowed if a firewall (e.g. iptables on Linux) is used. For a quick assessment, in case the X-server does not show the dtlogin screen, the following commands on the Linux system running Xephyr can be used to turn off the firewall temporarily (depending on what firewall is being used).

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The mechanism described above is only valid for Linux operating systems on which the Charon-SSP Manager runs. On other systems, for example Microsoft Windows system, you can use alternative X-server applications. However, the steps are different from the ones used via the Charon-SSP Manager on Linux. As the first step, you must install an X-server. There are several commercial products. However, there are also free X-server packages, for example the X-server integrated in Cygwin, VcXsrv, or Xming. For example, the installer for Xming and more product information are available on http://www.straightrunning.com/XmingNotes/. Please also refer to the non-Cloud product documentation for additional information.