Subject: How to use nmap port scanner to scan for Log4j/Log4shell security vulnerability Good day from Singapore, I have Ubuntu 21.10 Linux installed as a virtual machine under Oracle VM VirtualBox 6.1. Host operating system is Windows 10 Pro. But, I want to use this Ubuntu 21.10 Linux as a Hyper-V virtual machine under Windows Server 2019. In this case, you need to convert VirtualBox VMDK virtual harddisk into Hyper-V VHDX virtual harddisk. You can use the follow guide. Reference guide: How to Migrate VirtualBox VMs to Windows 10 Hyper-V Link: https://www.groovypost.com/howto/migrate-virtual-box-vms-windows-10-hyper-v/ After you have finished converting VirtualBox VMDK into Hyper-V VHDX, you can now import the virtual machine into Windows Server 2019 Hyper-V. I shall not cover the details here. The important point is you must create a new virtual switch in Hyper-V Manager with an 'External" connection. When you try to start the Hyper-V virtual machine, you will encounter the...