A warning sign indicates non-compliant port group policy for an iSCSI-bound VMkernel adapter.
The VMkernel adapter's port group policy is considered non-compliant in the following cases:
The VMkernel adapter is not connected to an active physical network adapter.
The VMkernel adapter is connected to more than one physical network adapter.
The VMkernel adapter is connected to one or more standby physical adapters.
The active physical adapter is changed.
Follow the steps in Change Network Policy for iSCSI in the vSphere Web Client to set up the correct network policy for the iSCSI-bound VMkernel adapter.