July 28

Sendmail rejected — Default CentOS Installation

Sendmail rejected — Default CentOS Installation

——————————————————————— – OVERVIEW / THOUGHT PROCESS – ——————————————————————— After completing a brand new minimal install of CentOS 6.4, I configured the installation to be a web server using apache, mysql and sshd for remote access.  After configuring a website on the box, I attempted to send an email from the local webpage, but never received.

May 15

IP Tables (explanation in efficiency)

IP Tables (explanation in efficiency)

——————————————————————— – OVERVIEW / THOUGHT PROCESS – ——————————————————————— IP Tables are a set of rules that you define to allow or reject network traffic from entering into your system. The ones that I am referring to are for a UNIX (Linux) type system.  As a default, the IP Tables specify what’s called an ‘implicit deny’.

March 2

phpMyAdmin Install (MySQL Web GUI)

phpMyAdmin Install (MySQL Web GUI)

——————————————————————— – OVERVIEW / THOUGHT PROCESS – ——————————————————————— I personally prefer to manipulate MySQL via the command line, but this is not always the best way to do it.  The perfect example was the last time I traveled.  I was using SSH to talk to my server and the internet went down.  Unfortunately, the instance.

February 23

Apache Virtual Host (httpd restart – fail)

Apache Virtual Host (httpd restart – fail)

Alas, I had Just created ServerTheory.com and imagine how excited I was!  There were only a few things that I needed to do in order to make this happen.  I needed to register the domain name, create DNS entries, point my new domain name to the correct DNS servers, and make sure all of the.

February 22

Postfix Troubleshooting (‘TLS not available due to local problem’)

Postfix Troubleshooting (‘TLS not available due to local problem’)

I woke up this morning with around 38 emails sitting in my postmaster email account with basically the same script that you see right below… without the $ bolded manual commands, of course.  The only thing that I could identify at the time was the last line that said ‘TLS not available due to local problem.’.