Host OS: Windows 8.1
Virtualization: VMware workstation v10 (have not tried in vSphere yet)
VM: Cisco NX-OS Simulator
Serial Connection Client: KiTTY (PuTTY will work just fine)
Step 1. Start the VM and open virtual machine settings windows.
Step 2. Add a Serial Port and select “Output to named pipe” when prompted
Step 3. Make sure settings are similar to screenshot below and click Finish.
Step 4. Power on VM and launch KiTTY and open a serial connection like below.