If you have write access to the data directory and have not set a master 
password, you can change the admin password by editing:
security/usergroup/default/users.xml

Change the line like this:

<user enabled="true" name="admin" 
password="digest1:D9miXH/hVgfxZJscMbfXtbtliG0WOxhLfsznyWfG38X2pda2JOSV4POi55PQI4tw"/>

To:

<user enabled="true" name="admin" password="plain:PASSWORD"/>

where PASSWORD is your new temporary password in plain text. I do not 
think you need to restart GeoServer.

This technique is also useful for scripted installations of GeoServer.

Because storing passwords in plain text is a bad practice, you should 
log in and change the admin password again to ensure it is stored as a 
digest (cryptographic hash), not as plain text: under Security / 
Users/Groups/Roles / Users/Groups / click on admin / fill in a new 
password (twice) and press Save.

Check security/usergroup/default/users.xml to satisfy yourself that the 
password digest is now stored (not plain text).

Kind regards,
Ben.

On 03/12/16 09:58, ldong wrote:
> Hi,
>
> This is a simple question, but it is important. I forgot the password to
> login to geoserver for web administration. It has to be a way to reset;
> please help.
>

-- 
Ben Caradoc-Davies <[email protected]>
Director
Transient Software Limited <http://transient.nz/>
New Zealand

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