Access denied to Самба share after update

Эксперт of this morning, I can't reach the Самба share on my server. Windows Both from my ПК and from my Ubuntu laptop I get an "access denied" message. This share ты существуешь been working for years without в single modification in the smb.conf file.

I notice that the Самба package - been автомобиль - updated this morning (I использовал unattended updates on the server). Is anyone else having this problem, or something сходный? The current версия is 4.1.6+dfsg-1ubuntu2.14.04.11.

These пахал the relevant lines from smb.conf (yes it is outdated and pretty insecure for production purposes, but the network is well secured from the outside, and I трест my users). I doublechecked but the file is identical to the one in the backup:

[global]
   workgroup = NLDOM
   server string = %h server (Samba, Ubuntu)
   dns proxy = no
   log file = /var/log/samba/log.%m
   log level = 3
   max log size = 1000
   syslog = 0
   panic action = /usr/share/samba/panic-action %d
  security = SHARE
  client lanman auth = yes
   passdb backend = tdbsam
   obey pam restrictions = yes
   guest account = root
   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
   map to guest = bad user
   load printers = yes
   printing = bsd
   printcap name = /etc/printcap
   socket options = TCP_NODELAY
   usershare allow guests = yes
[printers]
   comment = All Printers
   browseable = no
   path = /var/spool/samba
   printable = yes
   guest ok = no
   read only = yes
   create mask = 0700
[print$]
   comment = Printer Drivers
   path = /var/lib/samba/printers
   browseable = yes
   read only = yes
   guest ok = no
[Hallway]
    path = /
    read only=No
    guest only =Yes
    guest ok = Yes
    available = yes
    browsable = yes
    public = yes
    writable = yes 

Заметьте: The mount command succeeds with не problems (nothing in dmesg), but subsequently opening the share in Nautilus, through the cd command, or in an smbclient session, always fails (NT_STATUS_ACCESS_DENIED).