I have the same exact issue. I’ve got 3 different hosts on 3 different networks, but they’re all able to talk to each other.
This is a brand new vSphere 6.7 U3 setup with the latest patches. All hosts are running ESXi 6.7 with the latest patches.
I don’t see any issue or loss of connectivity in the vSphere client itself, but the Skyline Health thing always reports the ESXi host connectivity issue.
I’ve monitored network traffic at one of our firewall appliances, and I see the UDP packets are not being blocked in any way, but I see very few of them. I certainly do not see one every 10 seconds. I see one from a given host IP to the VCSA IP about once every 2 minutes. No, the network is not congested. They’re all in the same rack in the same data center, and they’re the only things connected to that rack’s switch.
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