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To reset the administrative password:

su – zimbra
zmprov sp

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!

Resource: https://wiki.zimbra.com/wiki/Admin_Password_Reset