Required Settings for Samba NT4 Domains
Samba usually doesn't require any changes on your Windows OS!
Please read very carefully, why and when you should do them: The changes mentioned on this page are only necessary if you want to join a Windows7 and later or Server 2008 and later to a Samba NT4-style domain. If this isn't your situation, then it's highly recommented NOT do do any registry changes! It's not required and not recommended if you run Samba as an AD DC!
Joining Windows to a Samba NT4-style domain
If you try to join any of the above mentioned OS you'll encounter an error
The following error occourred attempting to join the domain „.....“: The specified domain either does not exist or could not be contacted.
The following registry change work with any Samba version that isn't already discontinued:
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManWorkstation\Parameters] "DomainCompatibilityMode"=dword:00000001 "DNSNameResolutionRequired"=dword:00000000
Do the changes manually in regedit.exe or save the above in a plain text file with Notepad/Editor (not Word/Wordpad/OpenOffice/LibreOffice/...!) and name it sambafix.reg. Make sure, that the file has the ending .reg. Then you can import it directly to your registry by double-clicking, if you have the sufficient permissions.
After the next reboot you can join the machine to your domain, but you may still encounter an error:
Changing the Primary Domain DNS name of this computer to "" failed. The name will remain ".....". The error was: The specified domain either does not exist or could not be contacted
But this error can safely be ignored or, if you run Windows 7, silenced by a hotfix, that was published by Microsoft: KB2171571: You incorrectly receive an error message when you join a computer that is running Windows 7 or Windows Server 2008 R2 to a Samba 3-based domain.
Windows 8.1: Encountering Error code 0x80090345 launching Windows Credential Manager
If you are joined to a samba NT4-style domain then the following registry change should work for you see Workaround section in KB3000850 for more details
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb] "ProtectionPolicy"=dword:00000001
you will need to reboot after making the above registry change.
Windows 10: „No logon servers available“
If you have successfully joined Windows 10 to your Samba NT4 domain and try to login, you may encounter the error „No logon servers available“. To workaround, set in your PDCs smb.conf:
max protocol = NT1 # Be aware, that this setting prevent your clients to use # newer SMB protocol versions, than SMB1 with this server!
After you've restarted Samba, you will be able to login with a domain account on Windows 10.
IMPORTANT: Registry changes that should never be done!
There are many pages on the internet, which suggest to change the values of RequireSignOrSeal and RequireStrongKey. This is NOT recommended by the Samba team, as it will break interoperability with other Windows and Samba versions!
If you have already changed these parameters, turn them back to 1 as shown below and reboot:
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\System\CCS\Services\Netlogon\Parameters] "RequireSignOrSeal"=dword:00000001 "RequireStrongKey"=dword:00000001