Windows Server 12 R after DNS set up

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SUMMARY

After installing Windows Server 2012 R and configuring a DNS forest named ABC.com, the user encountered issues logging in with local administrator credentials (MYWIN\Administrator). Once a server is promoted to a Domain Controller (DC), local user accounts are replaced by domain accounts, preventing local logins. This behavior is standard for DCs, requiring users to authenticate with domain credentials instead.

PREREQUISITES
  • Understanding of Windows Server 2012 R features
  • Knowledge of Domain Controllers and Active Directory
  • Familiarity with DNS configuration in Windows environments
  • Basic concepts of user authentication in networked systems
NEXT STEPS
  • Research Active Directory user management in Windows Server 2012 R
  • Learn about the implications of promoting a server to a Domain Controller
  • Explore DNS configuration best practices for Windows Server
  • Study local vs. domain user authentication processes
USEFUL FOR

System administrators, IT professionals managing Windows Server environments, and anyone involved in configuring or maintaining Active Directory and DNS services.

Silicon Waffle
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After I installed a fresh windows server 2012R, I could log in with administrator account, e.g MYWIN\Administrator (MYWIN is my computer name). Then I created a DNS/forest e.g ABC.com , I then could log in with ABC\Administrator.
For some reason I now sign out and would want to log in with MYWIN\Administrator, but the system says that my password is incorrect (I do enter "MYWIN\Administrator" in username textbox).
 
Hey Silicon,
By default, as soon as a system is defined as a Domain Controller (DC), you are no longer allowed to log into it locally. Local windows user accounts are stored within the SAM database. When a computer is promoted to a DC, this is replaced with a domain database. So when you provide your local admin credentials, there's nothing for it to check against.

This is normal behaviour for a DC. You must always login with authorised domain credentials.

Cheers
 

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