[Samba] Member can't join DC2 (The specified network name is no longer available)

[Luis Peromarta]

I understand DC2 has been powered off but not demoted from AD ?

Also, have you used RSAT sites and services to create your 2 sites ?


On 23 Apr 2025 at 10:23 +0100, Adnan R. via samba <samba at lists.samba.org>, wrote:
> I'm new to AD and Samba but we have been running 1 Samba AD DC on our
> network for a year now, without trouble.
>
> We have 2 sites, separated by a street and linked together with a site
> to site L2 VPN (EoIP on MikroTik). DC1 on site 1 (the currently running)
> and we are trying to run a 2nd DC (DC2 and DC4) on the 2nd site.
>
> idmap.ldb and sysvol are synchronized, `samba-tool drs showrepl` shows
> no error when the 3 DCs are online simultaneously. When joining AD from
> Windows 10 (test machines and VMs) from Site 1, DC1 is selected and
> joined. From Site 2, if DC2 or DC4 are online, they are selected and an
> error occurs : The specified network name is no longer available. (See
> NetSetup.log in attachments).
>
> - Site 1:
> -- DC1 is a turnkey linux LXC on Proxmox : 10.190.0.11
> -- DC1 samba version : 4.17.12 on Debian 11
>
> - Site 2:
> -- DC2 is a manually installed LXC on Proxmox : 10.133.0.11
> -- DC2 samba version : 4.17.12 on Debian 12
> -- DC4 is a manually installed LXC on Proxmox : 10.133.0.40
> -- DC4 samba version : 4.17.12 on Debian 12
>
> For some details, at first we created DC2 and joined as member. Didn't
> know much, it was used for freeradius. This machine (DC2) was
> reinstalled (without leaving the forest) from scratch 2 or 3 times and
> joined back the forest, with same name (DC2) and same IP/MAC, but no
> member ever joined on 2nd site. After realizing it may have been a big
> mistake, I shutdown DC2 and installed from scratch DC4 with different IP
> and MAC.
>
> Windows 10 join tests were made with a VM on 10.133.0.0/16 network, with
> DC1 + DC2 online, DC1 + DC4 online, and DC1 + DC2 + DC4 online. When DC2
> or DC4 are chosen to join, error. When DC2 and DC4 offline, joining DC1
> is fine.
>
> What did I do wrong please?
>
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