KB ID 0000815 Dtd 15/05/13
Seen when connected to the VMware VI client software, and attempting to open a console session with a virtual machine.
This is a pretty generic error, for whatever reason the client software cannot connect to the KMS (Keyboard, Mouse, and Screen).
In NEARLY every case this is a communication issue, either the machine running the client software cannot resolve the name of the ESX host that is hosting the virtual machines, or TCP Port 902 is being blocked by a firewall.
3. You should now be able to connect.
It’s NOT DNS!
If you can happily resolve the name and are sure that the port is not being blocked, then have you made any IP changes? Is the default gateway on the ESX Server set correctly? And finally restart the management agents on the host, either from the console, or by running ‘/sbin/services.sh restart’.
I’ve also fixed this error by shutting down the machine > removing it from the inventory > then browsing the storage, to locate the .vmx file > then simply import it back again.
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