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Pages with category Security

  • A firewall inside Apache

    If you are running a webserver, you should use a webserver firewall. This prevents many attacks from being perpetrated on to your servers without the need to make your own applications more complex than necessary.

    The idea is very simple, if you have a few people who can edit your data from the Internet and those have a static IP address, you can check that the editor pages are only accessible to those IP addresses. Any other access can simply be blocked.

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  • Apache and weird errors

    Error about a local certificate?!

    The other day, I got a new certificate from godaddy.com. I installed the certificate by replacing the files and simply restarting Apache. I then checked in Sea Monkey and it worked great. Checking the certificate it told me "valid for another 3 years."

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  • at job spool growing

    How it works

    The at command is often used to start a process at a later time. It can run any script at a specified date and time.

    For instance, if you want the computer to send you a signal in one hour, use something like:

    cat signal | at -q z now + 60 minutes

    Assuming that the file named signal contains the commands necessary to generate the signal. Then in 60 minutes, the script will be execute and the signal will be heard or shown.

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  • Authentication Failing for some or all users

    Since my last upgrade, I had many small things that went awry on my computer. From tsearch2 in a Postgres database to ownership of files to the following authentication problem:

    root@mycomputer:~# su - www-data
su: Authentication service cannot retrieve authentication info
(Ignored)
www-data@mycomputer:~$

    Note that with su it ignores the fact. With cron it was not being ignored, so I'd get no work done!

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  • 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:

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  • Extremely slow pg_connect() call

    Got to setup a new server and first got the firewall to where I wanted it to be:

    • Block everything except ssh, Apache, SMTP, a few other things, but really not much more than that.
    • Block everything with IPv6 since we don't use it.

    Then I installed Apache and a couple of websites.

    The first one finally started to work, but it was so very slow to show up. I checked the code, the database, nothing wrong... And the database is lightning fast! ( in comparison to our previous server that is.)

    read more...
  • 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:

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  • Installing an Ubuntu Server & more

    1) Getting the OS

    Back to summary

    First go to http://www.ubuntu.com and get the latest version you're interesting in. They offer server version that they support for 5 years or so. I suggest one of those if you want to run a server. This is an ISO, in generate around 600Mb so be ready to wait a few hours... Even with a really fast connection, because the transfer will be limited by the mirror in most cases.

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  • Password Security

    I suppose we could talk about security all day and only barely touch the tip of the iceberg, if even more than a spec of it.

    Yet, I wanted to mention that in many instances, there are such limits to the characters you can use in a password that already the provider prevents you from creating a string password in the first place!

    So... what is it I'm talking about?

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  • PayPal secure website...

    Today I connected on PayPal to check out a sale and got a message from my system saying that a certificate could not be verified because it had a PayPal URL but pointed to geo-trinity.com.

    You can see the message below:

    You have attempted to establish a connection with "ekkef42kcpmrf2r3.stats.paypal.com". However, the security certificate presented belongs to "*.geo-trinity.com". It is possible, though unlikely, that someone may be trying to intercept your communication with the web site.

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    Programming language based on the C language adding object features to the language.
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  • debug

    When one of the early computers stopped working, it felt like the program was wrong. The fact was that a bug was crowling inside and generating electrical problems. Once the bug was removed and the computer fixed, the program worked again. Since then, a problem in a computer program is called a bug. The word de-bug means removing the bugs from the software program.

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