VMware ESXi 5 tab:
- Hit <F2>
- Login with the root username and password that you created during installation.
- Choose Troubleshooting Options
- Choose Enable ESXi Shell, and hit <Enter>
to change the value to 'Disable ESXi Shell'
- Hit <Esc>
Then try to ssh into the ESXi host, (mine is 192.168.137.131), with the root credentials.