When booting Alpine 1.8.3 with samba installed with winbind, permission on /var/cache/samba/winbindd_privileged/ is not set correctly. Squid is therefore unable to authenticate against Windows AD. A temporary workaround until the bug? is fixed is to set ‘chown .squid /var/cache/samba/winbindd_privileged/’ manually and restart squid.

(from redmine: issue id 41, created on 2009-06-02, closed on 2009-09-04)