The following procedure works with – Duplicati version 2.0.3.3_beta_2018-04-02 on a Windows 2016 Server with the Duplicati.WindowsService installed.
Open Services.msc. Open the Duplicati service’s properties (if the service is running, stop it). In the “Start parameters” box type “–webservice-password=new_password”. Start the service. Login to the web UI with “new_password”. Change the password and save it. Stop the Duplicati service again. Delete the “–webservice-password=new_password” from the “Start parameters” box. Start the service again, and you’re done.
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