Windows : Install Ubiquiti Unifi SDN Controller as a service

If you are operating Ubiquiti wireless gear compatible with the Unifi controller, and running it on a Windows machine, you may have noticed that you need to start the application manually every time you restart the computer. Fortunately, there is a way of adding it “as a service”, just like any OS/system services. Follow the… Read More »

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 :

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 : 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 »

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 :

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 :

 

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 »