FYI
slackware current (15 beta?)
upgrade from 1.4 to 1.4.3
i could not login, playsms audit.log and nginx access.log shows blocked
took me a long time, multiple reinstalls, restores etc
the problem was /var/lib/php was root:root and nginx was www:www
chown -cR www:www /var/lib/php fixed it.