We have recently installed VMWare ESX 3.5, I think. An outside consultant set it up for us. I've installed ISA 2006 (for web proxy only) on a Windows 2003 Server virtual machine. I cannot get ISA to work - someone here on EE said that ESX may have a built in firewall that could block traffic? Is this true and if so how do I administer this ESX firewall or disable it. Thanks for all the help.