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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 »

JunOS : Configure DNS forwarders on SRX device

If you want your SRX firewall to handle DNS requests on your network, you need to configure the forwarders to make this possible, in addition to a few other parameters. First, make sure you have no local forwarders set on the device itself as it cannot be used along with the dns-proxy service – if… Read More »

Windows : VMware Workstation VM fail to boot after crash with snapshot

Well this is embarrassing, my 11 years old workstation crashed while I had several VMware Workstation guests running (thanks for all those years of flawless runtime!). All my VMs had auto-snapshots enabled, meaning that VMware Workstation was automatically taking snapshots of my development VMs every day. Guests VMs with snapshot does not react so well… Read More »

Windows : Nmap error dnet: Failed to open device eth0

Experiencing the following issue with Nmap on Windows? $ nmap -P0 -sS -T5 0.0.0.0 Starting Nmap 7.70 ( https://nmap.org ) at 2019-06-04 03:14 ric dnet: Failed to open device eth0 QUITTING! It appears that some version of Npcap (or WinPcap) is causing issues. Updating Npcap to version 0.995 solve this issue. If you are running… 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 »

Windows : Show available memory with PowerShell

Here is the command how to show the available system memory on Windows with PowerShell command :

(systeminfo | Select-String 'Total Physical Memory:').ToString().Split(':')[1].Trim()

1	(systeminfo \| Select-String 'Total Physical Memory:').ToString().Split(':')[1].Trim()

Example :

PS C:\Users\user> (systeminfo | Select-String 'Total Physical Memory:').ToString().Split(':')[1].Trim()
32,767 MB

1 2	PS C:\Users\user> (systeminfo \| Select-String 'Total Physical Memory:').ToString().Split(':')[1].Trim() 32,767 MB

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

exim -bp

Show the amount of mail in the queue :

exim -bpc

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 :

exim -Mrm <message_id>

1	exim -Mrm <message_id>

Windows : Multiple connections to a server or shared resource by the same user, are not allowed

Having this error message when you login your Windows session : An error occurred while reconnecting X: to \\server-name\x$ Microsoft Windows Network: Multiple connections to a server or shared resource by the same user, are not allowed. Disconnect all previous connections to the server or shared resource and try again. This connection has not been… 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 »