ITechLounge.net

JunOS : How to add a DHCP address reservation

On Juniper devices acting as DHCP server, static reservation (static lease based on MAC address) can be achieved as followed : set access address-assignment pool <dhcp-pool-name> family inet host <client-host-name> hardware-address <client-mac-address> ip-address <client-static-ip> Example : set access address-assignment pool DHCP_Grp_v128_Pool1 family inet host mtrlpqm1lt0276 hardware-address 8c:ae:4c:c8:45:c5 ip-address 10.10.128.72 Then apply the configuration : commit… Read More »

VMware : Unsupported or invalid disk type 2 for ‘scsi0:0’. Ensure that the disk has been imported

The following issue will likely occur when importing a Virtual Disk vmdk into an existing machine, returning the following error when attempting to start the VM : Unsupported or invalid disk type 2 for ‘scsi0:0’. Ensure that the disk has been imported In my case, this happened importing Arista vEOS lab image and usually the… Read More »

Windows : Updates from 22H1 or 22H2 stuck with Your device is missing important security and quality fixes error

Your Windows 11 system may display the following error while running Windows Update at some point : Your device is missing important security and quality fixes For some reasons, the OS might be stuck at release 22H1 or 22H2 and without updates, with the message mentioned above. This behavior is known and referenced in Microsoft… Read More »

JunOS : Upgrade error return “This package requires 3MB more space free”

The following error may occur while attempting to upgrade JunOS with newer version. In this particular case, it occurred on a EX4300 running 18.4R3-S1.3 (and the target version was 19.4R3-S14.1). Due to limited flash memory size and constantly increasing size of newer software version, this issue may become increasingly common on some more entry level… Read More »

macOS : Dell Display Manager is consuming lots of CPU ressources

Dell Display Manager (or DDM) is a nice to have if you have Dell monitors, and unavoidable if you have the 43 inch monitor with the built-in KVM. Sadly, I noticed major slow down and high CPU consumption on my Mac M1 Pro since the beginning of the year. Looking at the Activity Monitor (or… Read More »

macOS : VMware Fusion keep asking if the VM was copied or moved

Recently with VMware Fusion 13.6.3 on macOS Sequoia 15.x, the application keep asking if the VM was “Moved” or “Copied” when the VM in question has been cloned, every time a start operation is executed, regardless if the question was asked and answered previously. It seem to be a known issue and the only way… Read More »

Linux : How to test Apache mod_rewrite

Apache mod_rewrite is a very popular server module that, as per name, manage URL rewriting in a very flexible manner. With the constant run around between server admins and developers (developers claiming : that’s the server, not the code – and the other way around for sysadmins : that’s the code, not the server); testing… Read More »

macOS : Mail server connection issue with Mac Mail or Microsoft Outlook

I recently faced recurrent and intermittent e-mail issue with macOS 15, where Mac Mail or Microsoft Outlook were in “disconnected mode”, unable to establish IMAP connection to fetch mail or SMTP connection to send mail. NOTE : This example will assume that the remote mail service that we cannot connect from is “mail.itechlounge.net”. Here are… Read More »

Windows : Sysprep was not able to validate Windows Installation

I recently encountered the following error while running SysPrep on a Windows Server 2022 machine recently : Sysprep was not able to validate Windows Installation. Looking at the SysPrep logs is necessary in order to find more about the error that was triggered. Here is the various locations of SysPrep logs : Generalize %WINDIR%\System32\Sysprep\Panther Specialize… Read More »

Web : How to disable NextCloud app from CLI

There are many reasons why you’d like to disable an app from the server terminal, such as when an app upgrade went wrong and NextCloud is stuck in the process. Once logged with SSH to your server, do the following : 1. Go to your NextCloud installation folder : cd /path/to/nextcloud Optional : If you… Read More »