ESXi installation is straightforward and unlike ESX installation, it does not prompt for any input from the user ( except license agreements) during the installation. so when you first install ESXi you wonder what is the login password, and guess what? the password is blank!! the default username is “root”
so the first time you login to your ESXI server using the VMware infrastructure client, and click on the summary tab you get this warning:
so how you change the password? it is very simple. when you first login to your VMware infrastructure client, you will get some basic tasks recommendation.
click on the Change the default password link you will be prompted to enter the password.
enter the password and click on OK.
now your ESXi server should be passworded.