Required settings for NT4-style domains

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General information

Samba usually doesn't require any changes on your Windows OS! Please read very carefully, why and in which situations you should do them! The changes mentioned on this page are only necessary if you want to join Windows 7 and later or Server 2008 and later to a Samba NT4-style domain. If this isn't your situation, then it's highly recommended NOT do do any registry changes! None of this modifications described on this page is required/recommended, if you run Samba as an Active Directory Domain Controller!



Joining Windows 7 or later / Windows Server 2008 or later to a Samba NT4-style domain

If you try to join any Windows 7 or later / Windows Server 2008 or later, you'll encounter an error

The following error occourred attempting to join the domain "SAMDOM":

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.



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: There are currently no logon servers available to service the logon request.

If you have successfully joined Windows 10 to your Samba NT4 domain and try to login, you will encounter the following error

There are currently no logon servers available to service the logon request.

To workaround, set in your PDCs smb.conf:

server max protocol = NT1

After you've restarted Samba, you will be able to login with a domain account on Windows 10.

Be aware, that this setting prevent your clients to use newer SMB protocol versions than SMB1 with this server! However, this is the way the Samba team recommends. There are suggestions out there, to disable newer SMB version on Windows 10 client(s) in general. However this will prevent them from using newer protocol version with any SMB servers, instead of a single one (PDC)!



Error: Changing the Primary Domain DNS name of this computer to "" failed.

If you encounter the following error on Windows 7 or Windows Server 2008R2, it can safely be ignored or silenced by a Microsoft hotfix (See KB2171571).

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



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
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