You need to access Oracle database server from your linux machine, installed the Oracle client and you get the message above. Actually this is not the full message that you get, the full stuff is something like that:
Error 6 initializing SQL*Plus
SP2-0667: Message file sp1.msb not found
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory
So you start browsing the internet and people is asking you to check the msb files are actually there, that you got rights to read, some people will tell you that write rights are needed as well in some folders, etc.
So you install your new machine, with Java, Tomcat and MySql and then you start everything. You use the very latest version of these products (currently Tomcat 8 and JDK1.8) and you expect the best. However, Tomcat starts very very slowly - anything between 2 minutes and 30 minutes.
Iptables is a tool that is used to configure the netfilter linux kernel module. This inspects all the incoming / outcoming network packets and decides what is to be done with each of them.
This article is not fully featured documentation, it only shows a number of commands and their functionality. Iptables capabilities are huge, however for most of the use cases the information present in this article should do.
Postfix is one of the most popular MTA (mail transfer agent) products on unix. This article presents a simple way of configuring postfix for virtual domains
This is just another tutorial of how to configure a development machine for Apache, PHP and MySQL