Recently, a ‘security service’ provider Alert Logic posted a blog post explaining how they uncovered a new security issue in Linux which they go further to say it affects ALL of the Linux platforms out there including mobile devices. They called it “grinch”. In actuality, what they’ve uncovered is expected behavior…
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The servers I set up all run CSF, an open source software firewall that utilizes iptables to block and shape how we allow access to the servers. Using their graphs, I’m able to see that the USA is the top offender for failed login attempts, port scans, etc.. using CSF, I’m going to block a couple of the next offenders (because I don’t want to block USA.. ). Read along to see how!
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As soon as you set up a server on the Internet, you’re a target. For instance, today is Dec 12th and I set up a new CentOS 7 server on my home network on Dec 8th, then port forwarded port 22 through the firewall (untangle) right to this machine. Today, I finally got around to installing CSF/LFD, but wanted to first see how many IPs had been attempting to ssh into this new box. Read on and i’ll show you how to easily find out.
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When using CSF, there will be times when you need to quickly ssh into a server and modify the csf blocks. It could be that a friendly IP got blocked or that you want to add a new block. The following short article will give you the most common command line options.
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You need more space on your server/desktop/etc..  This guide will help you add it to the volume you’re currently using on your system. For the sake of making this an easy-to-follow guide, we’ll assume that you already have the new drive showing in your Linux installation from fdisk, but it’s not yet usable (ie: you made it available from shared storage, you installed a new hard drive, etc..).

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You may think you know it all when it comes to listing out files. You have the permissions there, the owner, group and the filename. But, what else lies in the output? Read on to find out a couple things you didn’t know about the output of ‘ls -l’.
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Hardening WordPress

December 2, 2014 — Leave a comment

One thing we can’t stress enough is that wordpress sites need to have the correct permissions to help them stay safe.  There are other things as well, such as password protected logins, etc..  We’ll share some of the things we do that can help to harden your WordPress installation.
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I recently sold my other Linux blog with helpful Linux articles and now find myself looking to write more articles to help Linux users in their day to day activities.  This blog will contain articles relating to all aspects Linux and should be able to assist new users (as well as veterans) with our Linux tips and tricks.