A: Possibly. In VMware, if you change the virtual hardware or move the VM to a new ESXi host that changes the virtual MAC address range, yes. Always set a manual MAC address in the VM settings to prevent this.
sudo tail -f /var/log/unetlab/license_daemon.log # Look for: "ERROR -97" or "Connection refused" eve license host error -97-
like MATLAB or EVE-NG when this error appears, so I can provide more tailored file paths? A: Possibly
A less common cause of error -97- is an invalid system time. If your BIOS battery is dead or NTP is misconfigured, the license validation (which checks timestamps) may fail. A: Possibly. In VMware