Symptoms
-Attempting to vMotion vCenter from one ESXi node to another within same cluster gives error "Virtual Ethernet Card 'Network Adapter 1' is not supported"
Cause
The error message "Virtual Ethernet Card 'Network Adapter 1' is not supported" is a benign warning that can be safely ignored.
The error occurs when the vCenter Server tries to migrate a virtual machine to a host that does not support the network adapter type of the virtual machine.
However, the networking will still work correctly after the vMotion is complete.
The error message specifically mentions that the issue is with the guest OS on the selected host.
This is because the guest OS determines which network adapter types are supported.
For example, if the guest OS is a Linux distribution that does not support VMXNET3, then the vCenter Server will generate the error message even if the host supports VMXNET3.
Resolution
If you see this error message, you can safely ignore it and proceed with the vMotion. The networking will still work correctly after the vMotion is complete.
Here are some additional details about the error message:
The error message is not a limitation of the host in general. The host may support the network adapter type, but the guest OS may not.
The error message is specific to the virtual machine's configured guest OS on the selected host. If you migrate the virtual machine to a different host with a different guest OS, the error message may not appear.
The error message can be safely ignored. The networking will still work correctly after the vMotion is complete.
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