We have a new Dell T420, RAID5, out of the box, with ESXi 5.1 pre-installed, after installing the vSphere Client on my machine, connect and start to create storage, when it reaches Current Disk Format, it immediately disconnect the client. Sometimes I can reconnect, sometimes I have restart ESXi. I've changed IPs, as someone mentioned, IP conflict.
I have no CD or DVD drive, nor IDE ports to plug one up, just a SATA, which I don't have a SATA C/DVD drive to use. So, I trying to figure out how to fix or re-install ESXi.