environment Windows 2003 SP2, ISA Server 2006, Virtual Server 2005 R2 SP1 pre-RC1
story I upgraded to Virtual Server 2005 R2 SP1 RC1 remotely - somewhere in the middle, my Terminal Service Client connection disconnected - *PANIC*. But just keep calm and wait. I guess the network connection get shutdown due to some driver installation - the server became ready again by itself. I didn't need a reboot.