zimbra admin password reset

To reset the administrative password:

su - zimbra
zmprov sp <admin email address> <new password>

To get a list of all administrators:

su - zimbra
zmprov gaaa

To access the admin console:

https://YOURHOST:7071

Remember that the administrative console (sometimes) requires a full email address as the login name, so you may be using the correct password and the wrong login!