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Computers and internet is a big part of our social life today, as we increasingly use the online media we have greater chances to encounter security threats related to it. Facebook the leading social-networking website understands this security need well, and has launched an initiative to help user understand online security better. To safeguard users from online threats facebook is collaborating with major security software providers offering six month licences for users to products like Kaspersky Pure, Norton Antivirus, McAfee, AVG, Panda and many more for free - better, this lineup is not limited to PC only as security products for MAC and mobile are also provided free of cost.

While Microsoft Windows 7 is the mainstream Windows OS in use now, people still prefer and use Windows XP. I recently came across an Windows XP specific issue, where the computer detected security enabled WiFi networks but failed to connect with them as shown below.

As evident from the error message above and pretty descriptive error-icon shown below, Windows XP SP2 is having issues trying to negotiate security certificate. To fix this, enabling WPA and WPA2 encryption support on Windows XP in Wireless Group Policy (WGP) we need to install KB917021 update from Microsoft.

Apple blocks users from restoring older iOS firmware's, while this is a good security feature and a method to avoid OS fragmentation. This also prevents users from using jailbroken and carrier-unlockable software versions.

This practice makes iOS upgrade difficult for users relying on software unlock like ultrasn0w which is supported on older basebands only, If you are trying to upgrade an Apple device to an non-supported iOS version even when using TinyUmbrella - the iTunes restore process may throw up error 3194 and 1600 as shown below.

Here are solutions to get past these errors and flash custom, snowbreezed IPSW files to your Apple iPhone, iPad and iPod's.

Raspberry Pi does not feature an power on/off button, if it's receiving power it's ON and if not OFF. However, it is required to do a graceful shutdown or reboot as to prevent any operating-system corruption. Rebooting and Shutting down Raspberry Pi can easily be achieved by using "sudo reboot" (sudo if not using the root account) and "sudo shutdown -hP now" at the terminal. These commands can also be used over SSH terminal if you are running your RasPi headless (without a screen attached) or remotely over network.