After upgrade my ESXi to 6.7U2 and patch my vCenter, i realized that from time to time VMware tools is expired on some VMs and having the following error message when i'm trying to update VMware tools: Error while upgrading VMware Tools. Error code vix = 21009.
The Network card of One VM where VMware tools is expired is stop working from time to time. The workaround that i'm using is deactivate and reactivate the card.
Please i need help