Active Directory 2019 Won't Authenticate Users from Network Segment

Bradley Rinehart 96 Reputation points
2021-03-14T11:25:26.527+00:00

Original AD is Windows Server 2016. Raised Forest level to 2012 R2 then 2016. Installed second AD Windows Server 2019. Both are domain controllers. Both in same Forest, same Site, on same network segment (example 192.168.1.0/24). No issues with user authentication if PCs on same network segment as DC. Users on network segment 10.10.2.0/24 will authenticate if the original AD is connected to the network. Will not authenticate if on the new AD 2019 is connected to the network. Login error says that a domain controller cannot be found. PCs are Windows 10

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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Windows Server Security
Windows Server Security
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
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  1. Bradley Rinehart 96 Reputation points
    2021-03-15T00:39:45.29+00:00

    We did more research today. We discovered that the DNS server addresses on the PCs on that other network segment were only pointing to the original AD DC. We added the second AD DC to their DNS pointer and that solved the problem.

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