Install and configure a firewall on Ubuntu

Laptops, smartphones, tablets, smart TVs, etc. … in the current era we hardly find an electronic device that isn’t connected to the Internet. It is very practical to have the full power of the Net at our fingertips, but unfortunately it is not without risks as the threat of being hacked is a real threat.

One of the best ways to mitigate this risk is to install and configure a firewall. Let see how to do it on Ubuntu.

Install and configure a firewall on Ubuntu

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Setup a network proxy on Ubuntu

With this guide we will see how to set a network proxy on Ubuntu. We have already seen how to setup Mozilla Firefox to use a proxy, how to setup Google Chrome to use a proxy, and how to setup any browser to use a SSH proxy, but by setting a network proxy on Ubuntu, all network applications will automatically use it.

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How to fix the Heartbleed bug on your Linux Server

In the last few days a serious bug, nicknamed Heartbleed, has been found in the cryptographic software library OpenSSL.

This bug allows any ill-intentioned hacker to read the memory of the systems with the vulnerable versions of the OpenSSL software installed; with this kind of access an attacker can read the secret keys used to encrypt the traffic to the server including the usernames and passwords of the users and the actual content.

Fortunately only the 1.0.1 series (up to 1.0.1f) and 1.0.2-beta series (up to 1.0.2-beta1) of OpenSSL are affected by the Heartbleed bug.

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