I first download VM ESXi4.0 file VMware-VMvisor-Installer-4.0.0-171294.x86_64.iso and install on DELL PE2950 Box.
After finish creating VM and open VM console(through vSphere Client, as root user account), I see the same error message: unable to connect to MKS:Could not connect to pipe
.\pipe\vmware-authdpipe the system cannot find the file specified.
Then I upgrade to the latest: VMware-VMvisor-Installer-4.0.0.Update01-208167.x86_64.iso, and vSphere Client also upgade to the latest.
And still met this error message, and cannot install guest os on the VM.