Educating the world

Our blog has over 10,000 readers a month

Categories: "Computer Languages" or "C#" or "Java" or "Javascript" or "PHP" or "PowerShell" or "Python" or "SQL" or "Unix Shell"

Cloning a VirtualBox machine running CentOS causes network interfaces to fail

January 11th, 2013
When you clone a VirtualBox machine in order to create a new virtual machine (as opposed to creating a back up of an existing machine) then you must check Reinitialize the MAC address of all network cards and use the Full clone type to make sure that th… more »

Unable to generate a temporary class

November 2nd, 2012
If you use serialisation then IIS dynamically compiles the extra classes it needs to perform the serialisation and it uses the Windows temporary folders to store the class files definition and class compilation artefacts. If IIS can't write to the tempo… more »

SQL for beginners

October 4th, 2012
There are plenty of articles on how to get going with SQL (or MySQL) for beginners. However, there aren?t many articles which take you back to basics describing the building blocks used and help you understand the concept of what a database actually is.… more »

Installing VirtualBox, CentOS 5.4, Apache, PHP and MySQL

September 11th, 2012
I've recently done a project that uses load balancing. mod_proxy is a blog for another day but it was based on a LAMP stack. I install this all the time for lots of different projects. Some are development projects and some are just system administratio… more »

Cisco ASDM 5.2 for ASA ClassCastException X509TrustManagerImpl to X509ExtendedTrustManager

August 31st, 2012
I hadn't used my Cisco ASDM 5.2 for ASA for a while and when I needed to add a couple of extra users to the VPN it didn't work. Everything seemed to load in ok but when I tried to submit my login credentials it hung. I loaded the Java console and got t… more »