I downloaded and install the above ESXi version in October last year and was also assigned a license. It was installed with the license and has been running till now when I want to turn on a VM (GNS3) its saying that cant turn on the VM as Failed to power on virtual machine GNS3 VM. License key has expired
Is this to do with my GNS3 VM or the host itself. When I validate the license key I was issued it says License key is valid for VMware vSphere 6 Hypervisor
Appreciate any help as I need to turn on my GNS3 VM to conduct some test
According to the screenshot you've posted earlier, the host is still in evaluation mode, i.e. the license key has not been assigned/entered yet.
Please click "Assign license" on the ESXi host's licensing page, and enter your license key.