I have 2 VMs on the same ESXi 5.0 host, on the same vmswitch; they are the only VMs on this host. They can communicate with the rest of the network with no problem and they can also browse the Internet, but they cannot ping or browse each other. The Windows firewall is turned off on both machines. I have eliminated any DNS issues (one of the machines is DC and DNS server, and there is another DC/DNS server on the network as well), TCP/IP configuration issues, etc. File and Printer Sharing is turned on for both servers. One is running Windows 2008R2 Standard, and the other is Windows 2008 Standard. The only conclusion I can reach is that it's something in the ESXi configuration. Any ideas would be appreciated.