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This is my environment:

  • DC1 (PDC) - IP: 192.168.1.11/24
  • DC2 - IP 192.168.1.12/24
  • DC3 - IP 192.168.2.10/24

Subnet 192.168.1.x/24 is connected to subnet 192.168.2.x/24, and domain controllers are correctly replicating informations.

I have also a 3rd subnet 192.168.3.x/24, connected to 192.168.2.x but not to 192.168.1.x.

Issue:

  • If I join to domain a client that is on subnet 192.168.1.x or 192.168.2.x everything works fine
  • If I try to join to domain a client that is on subnet 192.168.3.x, it fails, and I receive this error: "An Active Directory Domain Controller for the domain mydomain.local could not be contacted

Moreover if I run "nlstest /dsgetdc:mydomain.local" on the same client, I receive: "Getting DC name failed: Status = 1355 0x54b ERROR_NO_SUCH_DOMAIN"

Can you suggest me a possible troubleshooting? Please tell me if I didn't explain clearly.

Thank you in advance,

Federico

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    What DNS server is the client on 192.168.3.x configured to use? – Greg Askew Jan 10 '17 at 15:28
  • Agreed with @GregAskew. It's always DNS. Always. :) – EEAA Jan 10 '17 at 16:24
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Can you check the DNS Settings of the client on subnet 192.168.3.0/24 and compare with the settings of a client on subnet 192.168.2.0 or 192.168.1.0? are they the same? if not try adjusting the DNS settings of the client on subnet 192.168.3.0/24 to match that of the client on subnet 192.168.1.0 or 192.168.2.0.

If the client is using a DNS server that doesn't host the DNS zone for your domain it would explain the issue.

Also has subnet 192.168.3.0/24 been added to AD Sites and services?

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Thanks everybody for anwers, DNS were correctly configured.

I ran "netdiag" and "net share" on domain controller and found that NETLOGON and SYSVOL share weren't available.

I followed this article (http://www.careexchange.in/sysvol-and-netlogon-share-is-missing-in-newly-built-domain-controllers-2008r22012r2/) to recreate them, and now clients from all the subnets can join to the domain.

Thank you again, Federico

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