Imported From: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/83bee152f222e3b4#
Hello,
I'm trynig this in v511, but it happens for a long time, and I want to
report it.
Install a website, and when it's running, relaunch maintenance panel via
"core/install.php".
It'll ask you what to do. If you clic on "reinstall inportal", you'll have
on next page the DB configuration. If you select "*Use existing In-Portal
installation in this Database*", and clic next, then the actual DB is
emptied, but you are redirected on maintenance login page, and now the
system have obviously forgot your root password, and you'll need to sort the
problem by yourself by removing manually config.php file to be able to do a
clean install.
p