Can't access samba from other computers in the network?

I have a server running Ubuntu 14.04. Recently, I set up a Samba server to share some files with Windows computers in the network. It's running, but only accessible from the computer it's running on. It has a static IP:192.168.2.10

If I connect: smbclient //192.168.2.10/NAS -U NAS, it works. But there is only one server. GUFWUse the Samba preset, by opening all required ports .

On other computers, the server is visible, but if I connect to it, I get an NT_STATUS_CONNECTION_REFUSEDerror.

Here is mine smb.conf, excerpted testparmbelow:

[global] 
        server string=%h server (Samba, Ubuntu) 
        interface=127.0.0.0 /8, p5p1 
        server role=standalone server 
        map to guest =wrong user 
        obey pam restrictions=yes 
        passwd program=/usr/bin/ passwd %u 
        passwd chat=*enter\snew\s*\password:*%n\n*retype\snew\s*\password:*%n\n*password\supdated\success*. 
        username mapping=/etc/samba/smbusers 
        syslog=0 log 
        file= /var/log/samba/log.%m 
        max log size=1000 
        load printer=no 
        printcap name=/dev/null 
        disable spool=yes 
        dns proxy=no 
        panic-action=/usr/share/samba/panic-action %d 
        idmap config*:backend=tdb 
        print=bsd
        print command=lpr -r -P '%p' %s 
        lpq command=lpq -P' 
        %p 'lprm command=lprm -P '%p' %j 

[NAS] 
        path=/home/NAS/NAS 
        effective user= NAS 
        read-only=no 
        guest normal=yes

Thanks!