//edit pro reset do 6.5 a 6.7 je nový článek

A. root

1.  Otevřít konzoli vCenter serveru (VCSA) přes vClienta připojeného k ESXi
2.  Mezerníkem do GRUBu
3.  Nechat výběr na VMware vCenter Server Appliance
4.  Zmáčkout p (password)
5.  Heslo do GRUBu je defaultně: vmware
6.  Vybrat druhý řádek kernel /vmlinuz-……………
7.  Zmáčknout e (editace)
8.  Přidat bootovací volbu: init=/bin/bash
9.  Potvrdit Enter
10.  Zmáčknout b (boot)
11.  Spustit: passwd root
12.  Restart VCSA

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2069041

B. administrator@vsphere.local

1. Log in to the vCenter Server Appliance via SSH.
2. Run this command to enable access the Bash shell:shell.set –enabled true
3. Type shell and press Enter.
4. Open the vdcadmintool service tool by running this command:/usr/lib/vmware-vmdir/bin/vdcadmintool

   This console loads:

   ================================
   Please select:
   0. exit
   1. Test LDAP connectivity
   2. Force start replication cycle
   3. Reset account password
   4. Set log level and mask
   5. Set vmdir state
   ================================

5. Press 3 to enter the Reset account password option.
6. When prompted for the Account UPN, enter:administrator@vsphere.local

   A new password is generated.
   

7. Use the generated password to log in to the administrator@vSphere.local account.
8. After the password is regenerated, log in to the vSphere Web Client and change the password.

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2034608#vSphere%206.0