[Samba] Re: net rpc vampire - cannot login to migrated computer accounts

John H Terpstra jht at samba.org
Sun Nov 13 16:41:29 GMT 2005

On Sunday 13 November 2005 09:21, Christoph Peus wrote:
> Christoph Peus wrote:
> > I've migrated our NT4 domain to sambe 3.0.20b/ldap backend with "net rpc
> > vampire", and nearly everything works as expected. But one big problem
> > remains: it's not possible to login to the domains member maschines now,
> > because "the domain is not available at the moment" (translated from
> > german). After the maschine rejoined the samba domain, login works. (But
> > this is not an option for our ~500 maschines...)
> I have to comment myself. I looked at the system eventlog of the client
> maschine and found the following error message from the netlogon service:
> "The domain of this computer (UNIWH) has been downgraded from Windows 2000
> or newer to Windows NT4 or older. This computer cannot function properly in
> this case for authentication purposes. This computer needs to rejoin the
> domain.


> The following error occurred: There are currently no logon servers
> available to service the logon request."
> Aha. That's a clear statement.
> It's true that the DC was downgraded from Windows 2000 to NT4, because the
> original domain is Windows 2000/AD runinng in mixed mode, but every
> reference to "net rpc vampire" and "AD in mixed mode" says that this works.
> Is it possible that "net rpc vampire" works only partially when used with
> AD/mixed mode?

The "net rpc vampire" migration process will migrate all accounts from ADS to 
Samba-3 (NT4-style domain), but all machines will need to re-join the domain.

NT4 domain accounts can be migrated without need for domain members to be 
rejoined to the domain. The "net rpc vampire" is inherently an NT4-style 
migration process. 

Samba-3 is not capable of being an ADS server, hence the need for domain 
members to be re-joined to the domain.

> BTW: I'm not the first to encounter this problem. Another samba user (Kang
> Sun) reported exactly the same problem about a year ago, but didn't get an
> answer.

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John T.

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