Samba does not work. Protocol negotiation failed: NT_STATUS_IO_TIMEOUT

Good day! I’m not good in linux. I have next problem:
Protocol negotiation failed: NT_STATUS_IO_TIMEOUT

smb.conf:


# smb.conf is the main Samba configuration file. You find a full commented
# version at /usr/share/doc/packages/samba/examples/smb.conf.SUSE if the
# samba-doc package is installed.
[global]
domain logons = yes
domain master = Yes
netbios name = ServerSMB
os level = 255
preferred master = yes
security = user
wins support = Yes
workgroup = Stud.VT
passdb backend = smbpasswd
usershare allow guests = Yes
ldap admin dn = 
usershare max shares = 100

# Настройки домашних директорий
####################################################
[homes]
comment = Home Directories
valid users = %S
read only = No
browseable = No

# Определение принтеров
####################################################
[printers]
comment = All Printers
path = /var/spool/samba
read only = Yes 
guest ok = Yes
printable = Yes
browseable = No

# Драйвера для принтера
####################################################
[print$]
path = /var/lib/samba/drivers/
guest ok = No
browseable = Yes
read only = Yes
valid users = @"Print Operators"
write list = @"Print Operators"
create mask = 0664
directory mask = 0775

# Настройка службы сетевого входа (logon)
####################################################
[netlogon]
comment = NLService
path = /var/lib/samba/netlogon
guest ok = Yes
browseable = No

# Ресурс профилей ( для переносимых профилей )
####################################################
[profiles]
comment = Roaming Profiles
path = /var/lib/samba/profiles
create mask = 0600
directory mask = 0700
browseable = No
guest ok = Yes
force user = %U
valid users = %U "Domain Admins"
read only = No
profile acls = Yes

# Определение разделенных ресурсов
####################################################
[share]
comment = data share
path = /opt/stuff
valid users = %U

rcsmb status:


Mar 15 18:22:53 linux-mg8w.site smbd[3784]: [2016/03/15 18:22:53.858662,  0] ../lib/util/become_daemon.c:137(daemon_ready)
Mar 15 18:22:53 linux-mg8w.site smbd[3784]: STATUS=daemon 'smbd' finished starting up and ready to serve connections

But the error appears when trying to get a list of resources:

smbclient -L localhost 
Enter admin's password: 
protocol negotiation failed: NT_STATUS_IO_TIMEOUT

I would be much grateful for the help

What does the result of running the following as root?

testparm /etc/samba/smb.conf

I found the problem. Samba conflict with DNS-server