If you have locked yourself out of your Zope/Plone admin area, you can add an emergency user in order to log in again. You can do this by running the following command from the bin folder of your Plone client (e.g. /opt/Plone-3.0.6/zeocluster/client1/bin):
./zopectl adduser user pass123
This will add a username user with password pass123 to your Plone and you will be able to log in again.
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