An Active Directory Domain Controller (AD DC) for the domain * could not be contacted

I faced the first time this error when I set-up a Domain Controller on Ubuntu using SAMBA 4 and I tried to join this domain using my Windows 7 machine.
Windows 7, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012 or Windows 8 require some registry changes while dealing with Samba server, to solve this problem just copy and past the following lines in a text editor like Notepad (or bloc note) and save it under .reg extension.

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManWorkstation\Parameters]
"DomainCompatibilityMode"=dword:00000001
"DNSNameResolutionRequired"=dword:00000000

execute .reg file as administrator, reboot and it's done !

Categories: fix samba errors, samba error, windows 7 and samba problems, windows 7 can't join samba domain