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

aere_premium.0k at icloud.com aere_premium.0k at icloud.com
Wed Apr 23 09:04:26 UTC 2025 

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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04/22/2025 12:20:39:623 -----------------------------------------------------------------
04/22/2025 12:20:39:623 NetpValidateName: checking to see if 'VM-WIN10-TEST' is valid as type 1 name
04/22/2025 12:20:39:623 NetpCheckNetBiosNameNotInUse for 'VM-WIN10-TEST' [MACHINE] returned 0x0
04/22/2025 12:20:39:623 NetpValidateName: name 'VM-WIN10-TEST' is valid for type 1
04/22/2025 12:20:39:669 -----------------------------------------------------------------
04/22/2025 12:20:39:669 NetpValidateName: checking to see if 'VM-WIN10-TEST' is valid as type 5 name
04/22/2025 12:20:39:669 NetpValidateName: name 'VM-WIN10-TEST' is valid for type 5
04/22/2025 12:20:39:701 -----------------------------------------------------------------
04/22/2025 12:20:39:701 NetpValidateName: checking to see if 'tech.example.com' is valid as type 3 name
04/22/2025 12:20:39:701 NetpValidateName: 'tech.example.com' is not a valid NetBIOS domain name: 0x7b
04/22/2025 12:20:40:279 NetpCheckDomainNameIsValid [ Exists ] for 'tech.example.com' returned 0x0
04/22/2025 12:20:40:279 NetpValidateName: name 'tech.example.com' is valid for type 3
04/22/2025 12:21:03:938 -----------------------------------------------------------------
04/22/2025 12:21:03:938 NetpDoDomainJoin
04/22/2025 12:21:03:938 NetpDoDomainJoin: using current computer names
04/22/2025 12:21:03:938 NetpDoDomainJoin: NetpGetComputerNameEx(NetBios) returned 0x0
04/22/2025 12:21:03:938 NetpDoDomainJoin: NetpGetComputerNameEx(DnsHostName) returned 0x0
04/22/2025 12:21:03:938 NetpMachineValidToJoin: 'VM-WIN10-TEST'
04/22/2025 12:21:03:938 	OS Version: 10.0
04/22/2025 12:21:03:938 	Build number: 19045 (19041.vb_release.191206-1406)
04/22/2025 12:21:04:001 	SKU: Windows 10 Professionnel
04/22/2025 12:21:04:001 	Architecture: 64-bit (AMD64)
04/22/2025 12:21:04:016 NetpMachineValidToJoin: status: 0x0
04/22/2025 12:21:04:016 NetpJoinDomain
04/22/2025 12:21:04:016 	HostName: VM-WIN10-TEST
04/22/2025 12:21:04:016 	NetbiosName: VM-WIN10-TEST
04/22/2025 12:21:04:016 	Domain: tech.example.com
04/22/2025 12:21:04:016 	MachineAccountOU: (NULL)
04/22/2025 12:21:04:016 	Account: tech.example.com\a.rihan
04/22/2025 12:21:04:016 	Options: 0x25
04/22/2025 12:21:04:063 NetpValidateName: checking to see if 'tech.example.com' is valid as type 3 name
04/22/2025 12:21:04:063 NetpValidateName: 'tech.example.com' is not a valid NetBIOS domain name: 0x7b
04/22/2025 12:21:05:079 NetpCheckDomainNameIsValid [ Exists ] for 'tech.example.com' returned 0x0
04/22/2025 12:21:05:079 NetpValidateName: name 'tech.example.com' is valid for type 3
04/22/2025 12:21:05:079 NetpDsGetDcName: trying to find DC in domain 'tech.example.com', flags: 0x40001010
04/22/2025 12:21:05:282 NetpDsGetDcName: status of verifying DNS A record name resolution for 'dc4.tech.example.com': 0x0
04/22/2025 12:21:05:282 NetpDsGetDcName: found DC '\\dc4.tech.example.com' in the specified domain
04/22/2025 12:21:05:282 NetpJoinDomainOnDs: NetpDsGetDcName returned: 0x0
04/22/2025 12:21:05:282 NetpDisableIDNEncoding: using FQDN tech.example.com from dcinfo
04/22/2025 12:21:05:298 NetpDisableIDNEncoding: DnsDisableIdnEncoding(UNTILREBOOT) on 'tech.example.com' succeeded
04/22/2025 12:21:05:298 NetpJoinDomainOnDs: NetpDisableIDNEncoding returned: 0x0
04/22/2025 12:21:07:079 NetUseAdd to \\dc4.tech.example.com\IPC$ returned 64
04/22/2025 12:21:07:079 NetpJoinDomainOnDs: status of connecting to dc '\\dc4.tech.example.com': 0x40
04/22/2025 12:21:07:079 NetpJoinDomainOnDs: Function exits with status of: 0x40
04/22/2025 12:21:07:094 NetpResetIDNEncoding: DnsDisableIdnEncoding(RESETALL) on 'tech.example.com' returned 0x0
04/22/2025 12:21:07:094 NetpJoinDomainOnDs: NetpResetIDNEncoding on 'tech.example.com': 0x0
04/22/2025 12:21:07:094 NetpDoDomainJoin: status: 0x40
04/22/2025 12:21:07:110 -----------------------------------------------------------------
04/22/2025 12:21:07:110 NetpDoDomainJoin
04/22/2025 12:21:07:110 NetpDoDomainJoin: using current computer names
04/22/2025 12:21:07:110 NetpDoDomainJoin: NetpGetComputerNameEx(NetBios) returned 0x0
04/22/2025 12:21:07:110 NetpDoDomainJoin: NetpGetComputerNameEx(DnsHostName) returned 0x0
04/22/2025 12:21:07:110 NetpMachineValidToJoin: 'VM-WIN10-TEST'
04/22/2025 12:21:07:110 	OS Version: 10.0
04/22/2025 12:21:07:110 	Build number: 19045 (19041.vb_release.191206-1406)
04/22/2025 12:21:07:110 	SKU: Windows 10 Professionnel
04/22/2025 12:21:07:110 	Architecture: 64-bit (AMD64)
04/22/2025 12:21:07:110 NetpMachineValidToJoin: status: 0x0
04/22/2025 12:21:07:110 NetpJoinDomain
04/22/2025 12:21:07:110 	HostName: VM-WIN10-TEST
04/22/2025 12:21:07:110 	NetbiosName: VM-WIN10-TEST
04/22/2025 12:21:07:110 	Domain: tech.example.com
04/22/2025 12:21:07:110 	MachineAccountOU: (NULL)
04/22/2025 12:21:07:110 	Account: tech.example.com\a.rihan
04/22/2025 12:21:07:110 	Options: 0x27
04/22/2025 12:21:07:157 NetpValidateName: checking to see if 'tech.example.com' is valid as type 3 name
04/22/2025 12:21:07:157 NetpValidateName: 'tech.example.com' is not a valid NetBIOS domain name: 0x7b
04/22/2025 12:21:07:298 NetpCheckDomainNameIsValid [ Exists ] for 'tech.example.com' returned 0x0
04/22/2025 12:21:07:298 NetpValidateName: name 'tech.example.com' is valid for type 3
04/22/2025 12:21:07:298 NetpDsGetDcName: trying to find DC in domain 'tech.example.com', flags: 0x40001010
04/22/2025 12:21:07:376 NetpDsGetDcName: status of verifying DNS A record name resolution for 'dc4.tech.example.com': 0x0
04/22/2025 12:21:07:376 NetpDsGetDcName: found DC '\\dc4.tech.example.com' in the specified domain
04/22/2025 12:21:07:376 NetpJoinDomainOnDs: NetpDsGetDcName returned: 0x0
04/22/2025 12:21:07:376 NetpDisableIDNEncoding: using FQDN tech.example.com from dcinfo
04/22/2025 12:21:07:376 NetpDisableIDNEncoding: DnsDisableIdnEncoding(UNTILREBOOT) on 'tech.example.com' succeeded
04/22/2025 12:21:07:376 NetpJoinDomainOnDs: NetpDisableIDNEncoding returned: 0x0
04/22/2025 12:21:10:063 NetUseAdd to \\dc4.tech.example.com\IPC$ returned 64
04/22/2025 12:21:10:063 NetpJoinDomainOnDs: status of connecting to dc '\\dc4.tech.example.com': 0x40
04/22/2025 12:21:10:063 NetpJoinDomainOnDs: Function exits with status of: 0x40
04/22/2025 12:21:10:063 NetpResetIDNEncoding: DnsDisableIdnEncoding(RESETALL) on 'tech.example.com' returned 0x0
04/22/2025 12:21:10:063 NetpJoinDomainOnDs: NetpResetIDNEncoding on 'tech.example.com': 0x0
04/22/2025 12:21:10:063 NetpDoDomainJoin: status: 0x40
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