Category Archives: Servers

Linux : apt-get Failed to fetch FailReason: ConnectionRefused

Experiencing the following issue trying to update your Debian distro using apt-get? # apt-get update Ign:1 http://deb.debian.org/debian stretch InRelease Hit:2 http://deb.debian.org/debian stretch Release Ign:3 http://repo.r1soft.com/apt stable InRelease Hit:4 http://repo.r1soft.com/apt stable Release Hit:5 http://security.debian.org/debian-security stretch/updates InRelease Ign:8 https://download.webmin.com/download/repository sarge InRelease Hit:9 https://download.webmin.com/download/repository sarge Release Err:11 https://packages.sury.org/php stretch InRelease FailReason: ConnectionRefused Reading package lists… Done W: Failed… Read More »

Linux : cPanel Unknown API Error when attempting to contact the remote system

Having the following message while trying to setup a DNS cluster with cPanel? Unknown API Error when attempting to contact the remote system This error is usually caused by firewall blocked port (most likely tcp-2087) and/or DNS record pointing to the wrong IP. To find out, have a look at the following log file :… Read More »

Linux : How to manage Exim mail queue

Here are some useful commands to manage the Exim mail server queue. Show the mail queue content : exim -bp Show the amount of mail in the queue : exim -bpc Delete a specific message in the queue, with the help of the first command in this example (exim -bp) to get the message ID… Read More »

VMware : Failed to reconfigure virtual machine VM_Name. Invalid operation for device ‘X’.

Encountering the following error message trying to increase space on a vDisk for a guest machine on VMware ESXi? Failed to reconfigure virtual machine VM_Name. Invalid operation for device ‘X’. This is most likely because you have one or more snapshot(s) present. You need first to delete/consolidate all snapshot before increasing the size of a… Read More »

Linux : Export Roundcube webmail contact from SQL to CSV

Here is a procedure how to export the saved address book contacts from Roundcube webmail directly from the MySQL database to a CSV file (please note that Roundcube natively support exporting contacts from the Webmail itself to CSV – this method is only in case you want to pull out old contacts from a database).… Read More »

Linux : How to install same package version between old and new RHEL/CentOS system

I recently had to provision a RedHat Enterprise Linux 6 system for a customer that owned a production system that I have provisioned four years ago. The new system requirement was to match the same package version as the old system (that they left un-updated since the deployment – fortunately for them it was an… Read More »

Web : ownCloud error Memcache \OC\Memcache\APCu not available for local cache

Encountering the following error with ownCloud? “Memcache \OC\Memcache\APCu not available for local cache Is the matching PHP module installed and enabled?” This usually mean that either the Memcache/APC module isn’t installed (or enabled), or a mistake in the ownCloud configuration is present. 1. Make sure the APC package is present on your system (the commands… Read More »

Windows : List logged-in users and kill session using command line

In some circumstances where you cannot use (or open) the task manager panel to see the logged in users on a system and need to terminate a opened session, you might need to know your way around the CLI to achieve this task. Those simple steps will show you how. 1. Open the Command Prompt… Read More »

Linux : How to reset cPanel max defers for a specific account

If one of your hosted user (or account) have accidentally reached the max deferred message that can be sent over an hour (and the issue have been identified and fixed), you can unsuspend the mail delivery by deleting the following file : /var/cpanel/email_send_limits/max_deferfail_domain.tld For example, if the domain name is “itechlounge.net“, the command to execute… Read More »

Linux : How To send a copy of outgoing emails of a sender to another address with Exim/cPanel

This article will show you how to copy all outgoing email (transparently) of a specific user to another email account with Exim/cPanel. There is no built-in feature to do so, but we will use the Exim highly flexible filter scripting capability that can be achieve from the command line. 1. Log into your cPanel server… Read More »