Tutorial

One of my friend told me he not received email from his relatives since 2 days ago. He guess maybe there was an error in our mail server.

So, I use my gmail account and send an email to one of my company mail account. Gmail can't send email, here the report :

This is an automatically generated Delivery Status Notification


Delivery to the following recipient failed permanently:


   


Technical details of permanent failure:

PERM_FAILURE: SMTP Error (state 14): 554 Service unavailable; Client host [209.85.132.245] blocked using relays.ordb.org; ordb.org was shut down on December 18, 2006. Please remove from your mailserver.

About JPEGsnoop

JPEGsnoop is a free Windows application that examines and decodes the inner details of JPEG and MotionJPEG AVI files. It can also be used to analyze the source of an image to test its authenticity. Every digital photo contains a wealth of hidden information -- JPEGsnoop was written to expose these details to those who are curious. You can download JPEGsnoop here.

How It Working

About PostgreSQL

PostgreSQL is an object-relational database management system (ORDBMS). It is released under a BSD-style license and is thus free software. As with many other open-source programs, PostgreSQL is not controlled by any single company, but relies on a global community of developers and companies to develop it.

Installation in Ubuntu

Now, I am going to install postgresql package. I am using ubuntu feisty and now want to download postgresql-8.1. The latest release of postgresql is postgresql-8.3.

[email protected]:/home/jafar# sudo apt-get install postgresql-8.1 

This morning I had one problem when I am trying to install postgresql-8.2 in my ubuntu box.

[email protected]:~$ sudo apt-get install postgresql-8.2
Reading package lists... Done
Building dependency tree      
Reading state information... Done
The following extra packages will be installed:
  postgresql-client-8.2 postgresql-client-common postgresql-common
Suggested packages:
  oidentd ident-server postgresql-doc-8.2
The following NEW packages will be installed:
  postgresql-8.2 postgresql-client-8.2 postgresql-client-common
  postgresql-common
0 upgraded, 4 newly installed, 0 to remove and 895 not upgraded.
Need to get 1007kB/4379kB of archives.

Berikut ini adalah perintah-perintah run (text command) pada windows XP. Dengan mengetahui perintah-perintah ini maka bisa lebih menghemat waktu ketika kita hendak membuka suatu program.

Tutorial dasar bagi yang ingin belajar merakit dan menginstall sebuah komputer.

If we think SSH Server default configuration are secure enough, perhaps it just a matter of time before some stranger can connect to our server. Because SSH default configuration can't give you full protection.

There are several ways to secure our SSH Connection. We can use all of it or if we prefer to choose one of it just try, it rather than trust to your SSH default configuration.

1. SSH server for default using port 22. Use other port such port 222, port 333 or other ports. Change the default port in sshd_config.

[email protected]:~$ sudo vi /etc/ssh/sshd_config

# What ports, IPs and protocols we listen for
Port 22

2. Dont allow root login, edit sshd_config again and set 'no' for root login or you can block it.

# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes