samba - Nov 2021 - Trust creation - ERROR: LOCAL_DC: CreateTrustedDomainEx2 - ERROR(0xC00000E0) - The specified domain already exists.

Try if you cann resolve the SRV-records in both directions from both
DCs. On the Linux DC do:
host -t srv _ldap._tcp.samba.local

host -t srv _ldap._tcp.win.local

On the Windows DC you can use "nslookup".
Only if both DCs can resolve the SRV-records you can establish the
trust. I normaly use a bind9 as a DNS-Proxy.I did a tutorial on the 2019
SambaXP about trusts here you will find the handout, it will describe
how to set up a DNS-proxy
https://www.kania-online.de/wp-content/uploads/2019/06/trusts-tutorial-en.pdf

Am 18.11.21 um 10:52 schrieb Emilian Mitocariu via
samba:
> The samba DCs have a bind9 DNS backend which forwards to a standalone
> internal DNS which at his turn forwards win.local to all the DCs in the
> windows domain
> 
> The windows domain has a conditional forwarder pointing directly to all DCs
> from samba.local.
> Should I change the conditional forwarder on the windows domain to point at
> the standalone internal DNS, which forwards samba.local to the DCs in that
> domain?
> 
> On Thu, Nov 18, 2021 at 11:42 AM Stefan Kania via samba <
> samba at lists.samba.org> wrote:
> 
>> Do you have a DNS-Proxy between your Domains? Without you can't
resolve
>> the SRV-records
>>
-- 
Stefan Kania
Landweg 13
25693 St. Michaelisdonn


Signieren jeder E-Mail hilft Spam zu reduzieren und sch?tzt Ihre
Privatsph?re. Ein kostenfreies Zertifikat erhalten Sie unter
https://www.dgn.de/dgncert/index.html
Download der root-Zertifikate: https://www.dgn.de/dgncert/downloads.html

Thanks, I've actually read that tutorial before :) and I have an internal
bind9 DNS separate from the AD that I'm already using as a DNS-proxy

As for the SRV records you mentioned, they get resolved on DCs from both
domains.
I don't think the problem comes from domains not being able to resolve each
other, considering that they do and the error I'm getting is:

ERROR: LOCAL_DC[SAMBA-DC3]: CreateTrustedDomainEx2 - ERROR(0xC00000E0) -
The specified domain already exists.

On Thu, Nov 18, 2021 at 12:56 PM Stefan Kania via samba <
samba at lists.samba.org> wrote:
> Try if you cann resolve the SRV-records in both directions from both
> DCs. On the Linux DC do:
> host -t srv _ldap._tcp.samba.local
>
> host -t srv _ldap._tcp.win.local
>
> On the Windows DC you can use "nslookup".
> Only if both DCs can resolve the SRV-records you can establish the
> trust. I normaly use a bind9 as a DNS-Proxy.I did a tutorial on the 2019
> SambaXP about trusts here you will find the handout, it will describe
> how to set up a DNS-proxy
>
>
https://www.kania-online.de/wp-content/uploads/2019/06/trusts-tutorial-en.pdf
>