vNEX
Expert
Expert

Hi,

it is a sudden case or it happens after some configuration changes in your infrastructure?

How they appear in the inventory HC view as disconnected (grayed), with red-cross sign...??

Also verify your account permissions on hosts I suppose they are not joined to the domain so your direct access account differs from account you used for login to vCenter server. I am I right?

There are too many unknowns so please be more specific...

Please post vmkernel and fdm.log from hosts.

Anyway as an reference for hosts diagnosis see:

VMware KB: Diagnosing an ESXi/ESX host that is disconnected or not responding in VMware vCenter Serv...

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