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    Creating SFTP-only User Accounts to Kill SSH Access

    Published September 26th, 2009

    How to create SFTP-only User Accounts to Kill SSH Access

    Blocking the Bad Guys Using iptables Rule

    Published January 31st, 2009

    How to block bad guy’s IP address/network using iptables

    Allowing a non-root user to run chown in a chroot like environment

    Published January 6th, 2009

    How to allow a non-root user to run chmod in a chroot like environment

    Creating a Chroot Jail Enabled FTP Service

    Published December 10th, 2008

    Problem Statement
    We really dislike plain-old FTP service for its lack of security. Unfortunately, there are still brain-dead (windows) programs out there that will not work with Secure FTP (SFTP) via SSH. When your users just cannot live without such brain-dead programs and you are tired of chasing down the vendors for a reasonable explanation for [...]

    Stopping ICMP timestamp-request/response for CentOS Server

    Published December 4th, 2008

    How to disable ICMP timestamp request/reply for your CentOS Server with PCI DSS compliance requirements

    Scanning Ports on Your CentOS Server

    Published November 27th, 2008

    How to scan your CentoOS server ports using nc and nmap utilities

    Restricting SSH Access Attempts Using DenyHosts

    Published November 25th, 2008

    Using DenyHosts to block invalid access to your SSH server

    Stop root Login via SSH Immediately!

    Published November 25th, 2008

    Problem Statement
    If you are still allowing root login via SSH, you love living on the edge, don’t ya? I didn’t think so. Here in this short article you will find out how to disable root login and still gain root access in a manner that is safer than direct root login via SSH.
    Disabling root user [...]

    Securing WordPress Blog Upload Directory

    Published November 10th, 2008

    How to secure Word Press upload directory.