Now I have found another way, you may have your firewall closed by default, but you will be able to open it when you need to access your server, and closed it again after use, the package that will do the magic is knockd, and as its name says, you will knock the door of the firewall and it will open itself for you, but you will need a secret type of knock, it is like the "Open/Close, Simsim" (Open/Close sesame).

Now, let's go to the point, and see how to install and use knockd

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In our few examples today (which won't cover much but should be explained with a good amount of detail), we're going to use a file named ".htaccess" (the dot at the beginning of the name is important!) placed in our web server's root folder (or base folder, etc) which contains the "mod_rewrite" rules. Our first example will implement the equivalent of a 3xx redirect using "mod_rewrite" instead of the more conventional methods. In order to implement this, just place the following content in your .htaccess file.

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Nguyen Minh Duc, a researcher at Bach Khoa Internetwork Security Centre, a Hanoi-based security firm that is commonly known as Bkis, showed how attackers could break into laptops from Lenovo, Toshiba and Asus featuring face-recognition technologies, simply by using digitized images of the actual user of the systems in each case. The attacks were conducted on a Lenovo system with its Veriface III technology, an Asus system featuring its Smart Logon software and a laptop using Toshiba's Face Recognition technology.

For many, migrating to Linux is a rite of passage that equates to a thing of joy. For others, it's a nightmare waiting to happen. It's wonderful when it's the former; it's a real show stopper when it's the latter.

But that nightmare doesn't have to happen, especially when you know, first hand, the most common mistakes new Linux administrators make. This article will help you avoid those mistakes by laying out the most typical Linux missteps. 

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Hasan Gafoor, Mumbai's police commissioner, said Monday that as once-complicated technologies - including global positioning systems and satellite phones - have become simpler to operate, terrorists, like everyone else, have become adept at using them. "Well, whether terrorists or common criminals, they do try to be a step ahead in terms of technology," he said.

Indian security forces surrounding the buildings were able to monitor the terrorists' outgoing calls by intercepting their cellphone signals. But Indian police officials said those directing the attacks, who are believed to be from Lashkar-e-Taiba, a militant group based in Pakistan, were using a Voice over Internet Protocol (VoIP) phone service, which has complicated efforts to determine their whereabouts and identities.