I, too have used VMware Fusion for several years.

I, too, have only just begun experiencing pop-ups in my MacOS host environment (macOS Sierra 10.12.5) coming from VMware Fusion (in my case: version 8.5.7) reporting that each of two MS Windows 10 Pro (version 1607 build 14393.1198) guest VM's "is attempting to monitor all network traffic, which requires administrator access."

I'm not aware of having installed any software in either guest VM that is designed to sniff network traffic, and I'd really like to know what OS services or installed applications might be trying to place my virtual network adapter in "promiscuous mode."

I really appreciate @wila 's background information and @Mikero 's diagnosis/research suggestions; however, I'd be truly grateful if anyone who has addressed this issue (@jbreitma and I can't be the only ones?) might share news of any Windows OS services or applications they found caused their Windows guest VM's to generate this VMware popup?

Thank you!