[Samba] Windows7 client can not see samba server in "Network Discovery" window.

[Yanni]

Hello everyone

I have setup samba4 on centos7 as a member only server using yum and is 
called jimmy.
A windows 2012 server for Active Directory and a win7 client for testing.
Both the client and jimmy are members of the same windows AD domain.
The problem is that jimmy does not come up on the client's "Network 
discovery" window.
Even if I type jimmy's IP address \\IP on the text box and hit enter I get:
Windows can not access \\IP, 0x80004005, unspecified error.

Disabling SElinux and firewall made no difference. Could someone please 
have a look at my smb.conf and advise whether I am missing something or 
there is an option that it shouldn't be there? All I am trying to do is 
store the windows profiles on a samba server.

Here it is:
   server string = Samba4 file server
   workgroup = TESTAD
   security = ADS
   realm = TESTAD.BIO

   #preferred master = yes
   #os level = 255
    domain master = no
    local master = yes
    browse list = yes

    encrypt passwords = yes
    template shell = /bin/bash
    name resolve order = bcast


#-------- Mapping RID--------

    idmap config *:backend = tdb
    idmap config *:range = 2000-3999
    idmap config TESTAD: backend = rid
    idmap config TESTAD: range = 10000-99999


    winbind trusted domains only = no
    winbind use default domain = yes
    winbind enum users = yes
    winbind enum groups = yes
    winbind refresh tickets = Yes
    winbind expand groups = 4
    winbind normalize names = Yes

    vfs objects = acl_xattr
    map acl inherit = Yes
    store dos attributes = Yes

    wins support = yes

#Logging Settings
    log level = 3
    log file = /var/log/samba/log.%m
    max log size = 50

[profs]
    comment = WinProfsStorage
    path = /disk1/profs
    read only = no
    directory mask = 0700
    profile acls = yes
    csc policy = disable
    guest ok  = yes
    admin users = "@TESTAD\Domain Admins"


Thank you