Find the sparkweb.xml file in the Conf directory, open it in your favorite text editor and place the following:joe
Where “joe” is any user you want to use as the admin. This will allow you to login with an account you know.
If this doesn’t work, open the same sparkweb.xml file, find the entry near the bottom that says true and change it to false.
Stop and start the service, open the admin console and you will be prompted to begin the setup again. You previous settings will be saved and you can press “save & continue” for most settings. When it asks for the admin account, fix it there.