There could be lots of reasons why this could happen. But for this client when I checked the lxadmin logs at /usr/local/lxlabs/lxadmin/log/lighttpd_error.log , it showed me,
2009-05-01 05:27:39: (mod_cgi.c.998) CGI failed: Permission denied /usr/local/lxlabs/lxadmin/file/phpsuexec.sh mod_cgi.c.1001: aborted
2009-05-01 05:27:51: (mod_cgi.c.998) CGI failed: Permission denied /usr/local/lxlabs/lxadmin/file/phpsuexec.sh mod_cgi.c.1001: aborted
To fix this, please run
Continue Reading/script/fixweb
Oh, do it from the GUI lxadmin gives you OR else, do it console based way.
Continue Reading# cd /usr/local/lxlabs/lxadmin/httpdocs/
# lphp.exe ../bin/common/misc/reset-mysql-root-password.phps