How to Deploy Ruby + Passenger + Nginx on CentOS Linux

Before we get started into the technical tutorial, let’s first review the technologies involved in this Ruby + Passenger + Nginx guide on CentOS Linux. Ruby is an agile, dynamic open source language focused on easy and natural code writing and reading, while keeping a nice and elegant simple syntax. Passenger is an app server that is used to server apps written… Read more »

How to Block XML-RPC Attacks on CentOS & cPanel Servers

XML-RPC is a protocol that uses XML to encode the calls and HTTP as a transport layer for its communication. XML-RPC means literally: XML Remote Procedure Call. It’s widely used in web applications, specilly by CMS like WordPress. Today we will show you how to Block XML-RPC Attacks easily. WordPress uses this XML-RCP to extend its functionality and features, it was… Read more »

mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication

After upgrading a PHP server from PHP 5.3.3 to PHP 5.6.x, working with MySQL Server 5.1.x on a plain CentOS 6.x 64 bits box, there were a few new web apps were showing this mysqlnd connection error: mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication This was the complete and exact error: mysqlnd cannot connect to MySQL 4.1+… Read more »

Error 0x800CCC80 in Outlook Email Client

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Error code 0x800CCC80 in Outlook ‘None of the authentication methods supported by this client are supported by your server‘ is a very common type of error when users are working with Outlook Email client. How can I fix 0x800CCC80 error in Outlook? If your email server runs cPanel, one quick fix is this: Browse to WHM >> Exim Configuration Manager >>… Read more »

KernelCare Installation Guide

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KernelCare is fabulous kernel update tool by CloudLinux. We started testing this kernel patch in a few servers and the result has been truly amazing, allowing us to avoid server downtime after kernel updates because of each server reboot we had to apply after the kernel was updated. Today we will show you how to run a KernelCare installation. KC… Read more »

How can I Turn On TCP SYN Cookie Protection on Linux?

Are you under DOS attack on your cPanel or Linux server and you need to stop that syn flood to avoid downtime? Many VPS and Dedicated servers suffer syn flood atttacks on their systems, it’s something really normal on Linux servers. One type of attack is called SYN Attack. TCP Syn attacks are what it is called as DOS (aka… Read more »