I have Samba 3.6.25-45 running with the following configuration. The read-only share should be available to the public without any username/password authentication. The Samba server will not be added to a domain. Client machines might or might not be part of a domain. If "server signing = disabled", clients can connect to the [test] share. If "server signing = enabled" or "server signing = mandatory" the client can no longer connect. In Windows, they get error "The specified name is no longer available". The machine log has an entry of "auth/auth.c:319(check_ntlm_password) check_ntlm_password: Authentication for user [userX] -> [userX] FAILED with error NT_STATUS_NO_SUCH_USER". I tried to overcome this with "nobody = *" in smbusers file but this forces a user/pass login prompt which is not desired. # ############################################################################ [global] workgroup = GROUP server string = Samba Server Version %v passdb backend = smbpasswd security = user map to guest = Bad User username map = /etc/samba/smbusers smb passwd file = /etc/samba/smbpasswd guest account = nobody domain master = no local master = yes encrypt passwords = yes server signing = disabled client signing = required load printers = no log level = 2 max log size = 50 log file = /var/log/samba/%m.log # ############################################################################ [test] path = /tmp/test case sensitive = no read only = yes guest ok = yes