@xoanan
Slim: stale lockfile found, removing it
Try to stop slim: #/etc/init.d/slim stop
Verify slim is not running: pgrep slim
If it's still running: #pkill slim
If /var/lock/slim.lock then #rm slim.lock
Delete #/var/run/slim.auth
Restart slim: #/etc/init.d/slim start
If it's still broken either reinstall or provide this info:
What did you install,modify,update before it broke?
Which version of slitaz,frugal or full install or upgrade.
Are you trying to login to the default unmodified tux account or is it a new account.
Copy/paste /var/log/slim.log at pastebin.com and post the link.