To restrict as much as possible attack on your name server and avoid your resources consumed by tons of illegitimate queries, it’s wise to disable recursive lookup from the Internet for domains that are not served by your DNS server. To achieve that, simply add those parameters to named.conf “options” section : recursion yes; allow-recursion… Read More »
Running large and high demanding hypervisor connected to SAN storage require jumbo (large MTU) frames to enhance I/O performance to the guests virtual machines. To achieve that, you need to use the command line since vSphere console do not allow to do such thing. 1. Stop all guest virtual machine and put the hypervisor in… Read More »
Using a SSD drive on Windows 7? You better have TRIM enabled for better performance and make your drive last longer. Windows should enable it by default. To check if it’s enabled, run the following command : fsutil behavior query DisableDeleteNotify If returned value is ” 0 “, this mean TRIM is enabled. If ”… Read More »
You may notice those symptoms after updating SpamAssassin : – High CPU usage – spamd keep flipping between “running” and “zombie” state This probably mean your SpamAssassin installation is missing rule set configuration files. To resolve this issue, simply try running : sa-update Since this should have been automatically done at the installation or upgrade,… Read More »
The normal.dot file is actually the default Office Word template file. Since Windows Vista and ultimately Windows 7, the location changed. This is actually the same location whatever Microsoft Office version you are using. %:\Users\%username%\AppData\Roaming\Microsoft\Templates *Please note that the file is now named “Normal.dotm“
This tutorial is about how to replace a failed member of a Linux software RAID-1 array. You can monitor the status of your software RAID array through mdadm with the following command : cat /proc/mdstat This is the kind of output you’ll get in case of the secondary drive is either dead or no longer… Read More »
You may experience this error shown on “dmesg” or system logs (/var/log/messages) : IPv6 addrconf: prefix with wrong length 126 This actually indicate a device on your network trying to broadcast IPv6 information that dosen’t match your network configuration. To get rid and disable this, simply run the following commands as root : echo 0… Read More »
If you are using WordPress engine and the Really Simple CAPTCHA plugin for your forms, you may encounter a blank image containing the word “captcha” instead of the automatically generated image after updating the plugin. Here is the procedure to resolve this issue : 1. Login as administrator 2. On the left side menu, click… Read More »
Since there is no longer any shortcut to start Internet Explorer 9 without addons, in safe mode on Windows 7, here is how to achieve that : The first, and quick method would be to simply type the following command into the search bar located at the bottom of the start menu : iexplore -extoff… Read More »
You may experience this issue trying to log into a computer which is a member of a Active Directory network : No Logon Servers Available to service the Logon request. This issue may actually resolved by removing the computer from the domain, reboot and join the domain again.