You should never leave VMware management ports open to the internet.

I suggest you install a Windows XP, Win Server inside the virtual, turn on the "automatic start up" on that VM, just after you the automatic start up of your virtual FW and use RDP with a 2 factor authentication (duo security is free and works beautifully), which now is you "management" machine.

Just my 2 cents on Virtual Security, since this is the setup I have :)