An administrator has recently audited the environment and found numerous virtual machines with sensitive data written to the configuration files. To prevent this in the future, which advanced…

Setting isolation.tools.setinfo.disable = true disables the SetGuestInfo VMware Tools RPC call, which prevents guest applications from writing arbitrary name-value pairs - potentially including passwords or tokens - into the VM's .vmx configuration file. This is an explicit VMware security hardening recommendation to stop sensitive data from leaking into configuration files that may be readable by vCenter administrators or stored unencrypted on the datastore. Without this parameter, any process inside the guest with access to VMware Tools can inject data into the host-side configuration.

isolation.tools.setinfo.enable = true is not a recognized VMware VM advanced parameter - the correct parameter name uses 'disable' as the key component, not 'enable'.

Setting isolation.tools.setinfo.disable = false explicitly keeps the SetGuestInfo capability enabled, which is the opposite of the intended hardening goal and allows sensitive data to continue being written to the configuration file.

isolation.tools.setinfo.enable = false is not the correct parameter name and would have no effect on the guest's ability to write configuration data - only the 'disable' form of this parameter is valid.