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  • Bad DKIM signature data

    Yesterday I had a customer sending me emails from a different account from last time. That different account is a Yahoo! account so in general there is no problems with that.

    Yet, this one time it did not make it. One of my email filters failed. Namely, the DKIM filter. It uses the dkim library to check mail messages and make sure that they indeed originate from where they say they are from.

    It is an interesting concept. In the following figure I show the standard scenario of a hacker sending me spam and a valid domain sending me an email:

    read more...
  • Connections to clamav.inoc.net, why is that?

    Lately, I noticed that I always had a clamav.inoc.net connection. I was wondering why... I did install clamav but I did not recall changing anything in Apache where I'd get requests from the outside that would look like clamav.

    The fact is I also installed freshclam. By default, that gives you a line like this in your netstat -a64 listing:

    read more...
  • Copying a partition

    Copying an entire partition to another when both are not of the exact same size (in blocks) can be tricky, especially if that partition includes special files such as /dev/hda and FIFOs.1

    Yet, there are several ways to do so:

    1. 1. Note that was the case especially in the 90's. As of today, things have come a long way and there are command line options one can use with the cp and tar instructions to copy pretty much anything. You will still have problems with some files such as locks, though. But you should not have to copy them!
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  • Force the download of any file

    How to force a download of any file in a CGI script

    I have been wondering for a while, now I have the answer, so I can share it with you guys.

    Your script has to do the following steps:

    1. Print a header which at least includes:

      1. Content-Type: application/force-download

        (you can also use octet-stream instead of force-download)

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  • FTP not working?!

    Well... I knew that a firewall could generate a few problems, but this one, I did not expect!

    I just could not FTP anything from my FedoraCore box. I checked the source system firewall, tweaked all sorts of options in the vsftpd.conf file to no aval.

    The error I was getting was this:

    read more...
  • imap_open() troubles

    I have been trying to get my imap_open() function to connect to my mail server.

    The mail server works just fine since I can use it over and over again to receive emails in Thunderbird.

    So...

    read more...
  • Moving a website from one server to another

    Moving a website to a new server

    Now and again, you have to move a website from one server to another.

    There are good and bad things about that, the main problem is with dynamic websites. Why is that? Simple: a dynamic website expects to access a database and if you hit the wrong server, that will go bad.

    What's the best solution?

    read more...
  • PAD File

    PAD File Module for Drupal

    Introduction

    You can find my PAD File module on Drupal.

    It is intended for any company and individual that has executable files for download but its customers and potential customers. The PAD File describes the content of such executable to the target machine (robots that spider the Internet for PAD Files).

    read more...
  • Quintuple Boot

    [vtoc title: Quick Index;]

    [collapse title=Basics]

    How to install your system to be able to boot from any Operating System

    Problems

    Problems with booting... numerous emails & posts about this one, that's for sure!!! Real solutions? Not really... In many cases people end up reinstalling their system from Scratch and once in a while even that doesn't work! But smart people have a way to fix their boot sectors without too much hurdle (instead of the hours it takes to install an OS.)

    read more...
  • Remote CVS with SSH

    To read files out of your repository via SSH, set your CVSROOT variable to something like this:

    export CVSROOT=":ext:login-name@host//cvs/path/root"

    What tells CVSROOT that it will get the data from an external host is the <em>:ext:</em> at the start of the URL.

    The <em>login-name</em> is your name or whoever's login name you can use to connect to the computer.

    It is assumed that you can already connect with SSH.

    read more...
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  • GUID

    A GUID is a Globally Unique IDentifier. It is used by objects that need to run on any computer in the whole entire world. It is very likely that, once in a while, two people will generate the exact same GUID, although quite unlikely. Each computer has a network card now and that card serial number is often used as a starting point to define GUID on that computer. GUID were invented by Microsoft for their operating system.

  • HTTPS

    Hyper Text Transfer Protocol Secure—The protocol used by browsers to communicate to web servers securely. The security is done with similarly to SSH. The transfer uses FTP like commands, but only one connection. Since HTTP 1.1 it is also possible to reuse the same connection for multiple files (pages, images, videos, etc.)

  • Internet

    Inter-Network. The Internet was created at a University to attempt to connect computers between each others from "far away places" (i.e. two buildings in the same University). The main concept was to create a set of protocols to make the systems work. Namely, the SMTP, FTP and TELNET. Now we have many others such as the well known HTTP, which is based on the TELNET concept.

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