[Samba] Can't access to \\ip after migration from samba 3 to samba 4.4.5

[Trenta sis]

Hi,

Recently we have migrated from samba 3 nt domain to samba 4 AD (4.4.5) and
we have detected that some applications are not working correctly, this
applications need to access to \\ip resource, with name works, but we have
some applications that needs to work only by ip
Also detected this problem with some cname in dns are not responding we use
bind9 + dlz, and we if we access from \\name works... what could be the
problem... I have tried to update windows (windows 2003) to latest updates,
reinstall some updates that can generate the problems but without success..
and I don't know how to solve this issue

Befaore migration all was working correctly, and we doesn't have added any
gpo or any other special change, only migrat from samba nt to samba 4 ad
4.4.5...

Anybody can help?

Thanks