Lantronix KVM Java error FIX: Use Latronix native client instead

Latronix KVM provides HTML5 console however its not possible to mount images there so you would need to set to Java console. I was getting the following error each time I tried to run their Java console:

"unsigned application requesting unrestricted access to system"

I tested Java 1.8, 1.7, 1.6, 1.5 and 1.4 and all failed to run spider.jnlp file of Latronix KVM and returned the above error. There was a fix suggested to run it using Java however it did not work for me either.

I managed to mount ISO image to the VM by using Latronix KVM client software SpiderView which can be downloaded on their website.

How install Xfce4 and RealVNC on Centos 7

Xfce is a lightweight desktop environment and it's a good choice as a GUI for servers running Centos 7 . It can be installed by using the following command :

yum groupinstall "Xfce" -y

However Xfce does not start properly with RealVNC on Centos 7. The following commands are needed to fix the problem according to RealVNC website :

Create a file called /etc/vnc/xstartup.custom and make it executable (chmod +x) with the following content :

#!/bin/sh
DESKTOP_SESSION=xfce
export DESKTOP_SESSION
startxfce4
vncserver-virtual -kill $DISPLAY


Create another file called /etc/vnc/config.custom and add the following commands :

-extension RENDER


and finally use this guide to fix "xfce GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: User of caller and user of subject differs." error on xfce startup.