samba - Jun 2021 - Failed to connect lsa server when trying to create a domain trust

Hi,

I'm trying to create a domain trust between a Windows server 2019 AD with
domain level 2016 and forest level 2012 R2 (let's call it win.local) and a
Samba 4.7.6 (Ubuntu 18.04) AD with domain and forest level 2008 R2 (let's
call it sam.local)

When I run: samba-tool domain trust create win.local --type=external
--direction=both and other variations of it, I always get this error:

ERROR: REMOTE_DC[dc1.win.local]: failed to connect lsa server -
ERROR(0xC000020D) - The transport connection has been reset.

oaad-dc7.oaad.local resolves to the right IP and the DCs I'm trying to
create the trust between are in the same network, so there should not be
any restrictions between.

Another colleague tried before me to create the trust with the AD Domains
and Trusts tool which failed with the error: "The security ID structure is
invalid."

Does anyone have any idea why this happens and how can I fix it?

On Wed, 2021-06-30 at 11:00 +0300, Emilian Mitocariu via samba
wrote:
> Hi,
> 
> I'm trying to create a domain trust between a Windows server 2019 AD
> with
> domain level 2016 and forest level 2012 R2 (let's call it win.local)
> and a
> call it sam.local)
> 
Try upgrading Samba, 4.7.6 is very old

Rowland