Here is the content of “extra options” :
domain logons = no
domain master = no
preferred master = no
local master = no
os level = 65
wins support = no
ntlm auth = yes
client NTLMv2 auth = Yes
workgroup = COMPANYNAME
realm = COMPANYNAME.INTRANET
idmap config * : backend = ldap
idmap config * : range = 55000-64000
idmap config COMPANY : backend = nss
idmap config COMPANY : range = 1000-54999
preferred master = no
security = ADS
encrypt passwords = yes
winbind enum users = Yes
winbind enum groups = Yes
winbind use default domain = Yes
winbind nested groups = no
idmap uid = 1000-54999
idmap gid = 1000-54999
client signing = yes
client use spnego = yes
password server = *
template homedir = /sharedfolders/homes/%U
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192