When I log into vcenter (version 5.0.0), one of my esx hosts is greyed out and shows as disconnected. The vms on the esx host also show as disconnected, but are still on (I can ping them and rdp into them). I am able to ping the esx host log into its ilo. So far, I've tried the following troubleshooting steps:
1) testing the management network from the dcui of the esx host. Everything passed.
2) restarting the management agent from the dcui.
3) restarting the management agent from ssh by running the following commands
When I try to connect to the esx host from the vcenter console, I get an error which says, "Cannot contact the specified host..The host may not be available on the network, a network configuration problem may exist, or the management services on this host may not be responding."
When I try to connect directly to the esx host (via hostname or ip address) from vsphere, I get an error which says, "Vsphere Client could not connect to [hostname]. An unknown connection occurred. (The request failed because of a connection failure)."