System Admin Account LockOut

Is there a way to reset the system admin password without having access to the admin console? Our sys admin password for a dev environment has been lost and we need to access the environment using the suite/portal/login.jsp page. Unfortunately there's no 'reset password' link on the login page since this is an on-premise installation using Appian v17.3.

Is there a way to reset a password without being able to login to Appian?

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