After some months not anymore logging in to my local jira instance, the User Name and PW kept in the Browser do not match. So no way to logon (I'm the admin, only user on my PC!)
Try this link to see if it helps. It walks through a few ways to recover the account on a server version https://confluence.atlassian.com/jira/retrieving-the-jira-administrator-192836.html
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