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JunOS : LIBJNX_FILE_SYSTEM_FAIL: /var/transfer/config/: No such file or directory

Encountered such issue in your log file of your Juniper network device? LIBJNX_FILE_SYSTEM_FAIL: /var/transfer/config/: No such file or directory This is most likely related to your configuration archival (backup), with such statement :

set system archival configuration [transfer-on-commit | transfer-interval]
set system archival configuration archive-sites "scp://user@IP_Address/path/to/folder" password "USER_Password"

1 2	set system archival configuration [transfer-on-commit \| transfer-interval] set system archival configuration archive-sites "scp://user@IP_Address/path/to/folder" password "USER_Password"

This is most likely caused by filesystem corruption and/or inexisting transfer folder on the filesystem. To resolve this issue, enter into… Read More »

Windows : Remote Desktop crash immediately after session opening

I ran on this issue where the Remote Desktop Client crashed the second it opened the session. There was a related entry in the Event Viewer that stated the following : Faulting application name: mstsc.exe, version: 10.0.17134.112, time stamp: 0x82251f4e It turned out that the issue was caused by a mapped printer. To resolve this… Read More »

Windows : How to remove license key and unregister

You may require sometimes to remove the license from a Windows installation, whatever this is to re-assign a license to another machine, or before publishing an appliance, etc. Follow this procedure to put back your Windows installation to the original installation state, license wise. The following commands need to be performed with the Command Prompt… Read More »

JunOS : Upgrade return ERROR: Package signature validation failed. Aborting install.

Experiencing the following error while upgrading JunOS? Verify the signature of the new package verify-sig: cannot validate certs.pem certificate is not yet valid: /C=US/ST=CA/L=Sunnyvale/O=Juniper Networks/OU=Juniper CA/CN=PackageProductionRSA_2018/emailAddress=ca@juniper.net ERROR: Package signature validation failed. Aborting install. This error could be caused by incorrect date and time set on your device (back in time). To validate the current value,… Read More »

Linux : There is no screen to be resumed matching …

Using “screen” on Linux to perform your important work? Way to go, SysAdmin 🙂 Then you might at some point encountered the following behavior – while attempting to resume a session using “screen -r”, the following message occurred : There is a screen on: 1610.pts-0.host (25/08/18 08:25:36 PM) (Attached) There is no screen to be… Read More »

Windows : How to display a message at the Windows logon

Similar as what you can do on linux with the Message Of The Day (MOTD), there is a way to display a message to users when they login to their session. Microsoft refer to this as a “legal notice” and can be achieved through the registry. 1. Open the Windows Registry Editor with elevated privileges… Read More »

Linux : How to get hardware serial number

The easiest way to get hardware serial and related information is using “dmidecode“. The command below should give you exactly what you need :

dmidecode -s system-serial-number

1	dmidecode -s system-serial-number

The command above does not usually work with “clone” computers/servers. Alternatively, you may use the command below, which will output all parts serial number availables :

dmidecode | grep "Serial Number:"

1	dmidecode \| grep "Serial Number:"

Windows : Upgrade the Ubiquiti Unifi SDN Controller

This tutorial will show you the simple steps to upgrade your Ubiquiti Unifi SDN Controller running on Windows. The software can be found on the manufacturer Web site (https://www.ubnt.com/download/unifi). We recommend using the LTS (Long Term Support) version unless you need the bleeding edge features. Upgrading to newer version might not allow downgrade in case of… Read More »

VMware : Unable to deploy OVF template, Next button greyed out

I was a bit stunned when I attempt to deploy the vSphere Replication Appliance on a new v6.7 cluster. The Next button on the very first page where you select the template files just never turned blue (it always stayed grey) after selecting the files, just like if I did not selected all the files… Read More »

Windows : How to retrieve Fiber Channel interface WWNs

Here is a simple PowerShell command that will output the FC host adapter interface WWNs.

Get-WmiObject -class MSFC_FCAdapterHBAAttributes -namespace "root\WMI" | ForEach-Object {(($_.NodeWWN) | ForEach-Object {"{0:x}" -f $_}) -join ":"}

1	Get-WmiObject -class MSFC_FCAdapterHBAAttributes -namespace "root\WMI" \| ForEach-Object {(($_.NodeWWN) \| ForEach-Object {"{0:x}" -f $_}) -join ":"}

If your interface have two ports, both will be output in order. This command have been successfully tested with QLogic adapters on Windows 2012 and 2016.