Error: Debian Lenny public key is not available: NO_PUBKEY 9AA38DCD55BE302B

You run

apt-get update

and get the following errors:

W: GPG error: http://security.debian.org lenny/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B
W: GPG error: http://ftp2.de.debian.org lenny Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B NO_PUBKEY 4D270D06F42584E6
W: You may want to run apt-get update to correct these problems

iRedMail 0.7.0: Open Source Mail Server With Postfix, Dovecot, Amavisd, ClamAV, SpamAssassin, RoundCube On Debian Squeeze (Debian 6.0)

iRedMail is a shell script that lets you quickly deploy a full-featured mail solution in less than 2 minutes. Its object is to make a Linux mail server installation and configuration simple, painless and easy to use. Most components used in iRedMail are provided by Linux distributions officially. It means that iRedMail users can get software update support for as long as the the distribution is supported. iRedMail supports both OpenLDAP and MySQL as backends for storing virtual domains and users. This tutorial shows how to use the OpenLDAP backend on Debian Squeeze.

How To Set Up Kojoney SSH Honeypot On CentOS 5.5

Kojoney is a low level interaction honeypot that emulates an SSH server. The daemon is written in Python using the Twisted Conch libraries. In computer terminology, a honeypot is a trap set to detect, deflect, or in some manner counteract attempts at unauthorized use of information systems. Generally it consists of a computer, data, or a network site that appears to be part of a network, but is actually isolated, (un)protected, and monitored, and which seems to contain information or a resource of value to attackers. This tutorial shows how you can compile and install updated version of Kojoney on CentOS 5.5 server.

Simple Patch Tools

Creating: When all you want to do is build a patch file that contains only the changes you've made today. Installing: I typically want to take a backup of the files that are going to be overwritten so that I can quickly undo the patch if necessary.

Ghosting The Machine

This is a short but potentially extremely handy guide to ghosting one Linux box to another (or simply making a full backup of a desktop/server). You might have a small office where you customise one desktop just how you like it and need to roll this out to N other PC's or simply want a backup of a server or desktop to another machine or even to an image file. The main tool here is netcat which is extremely powerful and has a multitude of other great uses that won't be covered here.

How To Install Alfresco Community 3.3 On Ubuntu Server 10.04 (Lucid Lynx)

This guide explains how to install Alfresco Community 3.3 on Ubuntu Server 10.04 (Lucid Lynx). Alfresco is the Open Source Alternative for Enterprise Content Management (ECM), providing Document Management, Collaboration, Records Management, Knowledge Management, Web Content Management and Imaging.

HowTo: Install Memcached With repcached "Built-In Server Side Replication" On Debian Lenny

People probably know about memcached and its high performance name-value based memory object cache interface. Its main purpose is to provide an easy to use distributed caching engine in a multinode environment. Have you ever wanted to let memcached handle replication?

Boot Linux Over HTTP With netboot.me

This tutorial shows how you can boot Linux over HTTP with netboot.me. All that users need is Internet connectivity and a small program (gpxe) to boot the machine. This gpxe program provides network booting facility. netboot.me allows you to boot into the following distributions: Debian, Fedora, OpenSUSE, and Ubuntu. netboot.me provides gpxe images for USB sticks, CDs, and also for floppies, i.e., you can boot from a USB sticks, a CD, or a floppy.

How To Defend slowloris DDoS With mod_qos (Apache2 On Debian [Lenny])

mod_qos gives some fine-grained opportunities to scale the number of used connections and to defend an attack according to bandwidth limits. Unfortunately it is only available as source-package and there are many possible settings, wich might be hard to setup for this special case. So I provide the way that helped me.

Fixing openerp-web init script bug

$ sudo mkdir /home/openerp

$ sudo chown openerp.nogroup /home/openerp

HTTPS with Apache

$ sudo apt-get install apache2

$ sudo a2enmod ssl

$ sudo a2ensite default-ssl

$ sudo /etc/init.d/apache2 restart

Forcing Apache to redirect HTTP traffic to HTTPS

Choose a ServerName/URL for your OpenERP Web service, like openerpweb.com:

$ sudo vi /etc/apache2/sites-available/default