I am trying to add an second domain controller (DC) to my domain. The server is running Windows Server 2012 R2. After getting the error when promoting it to an domain controller I tried uninstalling the AD DS role and joining the domain as you would do with an regular computer/server. I got the same error there to.

The error I get is: "The following error occurred attempting to join the domain "example.com". The user name or password is incorrect.".

I did join one other server to the domain with the same user and the same password and I am sure that I type the correct password. I've also tried to copy the password from Notepad into the password field. I am able to sign in to the other DC with the same username and password. The account that I am using is the built in Administrator account.

My question is how I should fix the error saying that I use the wrong user name or password.

  • What are you trying to do exactly? To build are forest maybe? Or do a LB setup? You might want to look at this if it is a forest you want. – MrMajestyk Feb 26 '15 at 10:26
  • Try qualifying the Domain Admin's credentials during the join. e.g. instead of parentdomain\Administrator try parentdomain.example.com\Administrator or the UPN Administrator@parentdomain.example.com. – jscott Feb 26 '15 at 11:02
  • @jscott I will try that later. I did by mistake crash my DC1 so I need to restart it physicaly.That can't be done until next week. – Dempa Mar 1 '15 at 12:13

The account that I am using is the built in Administrator account.

You have to use an account which is part of the Domain Admin group to join a client to your domain. Also make sure the DNS settings on the client are correct.

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  • The account is in the Domain Admins group and the DNS settings is pointing at the first DC. – Dempa Feb 26 '15 at 10:17
  • Anything in the Event Logs from your client and DC? First DC is also your DNS server? – duenni Feb 26 '15 at 10:26

Make sure you have joined the server to the domain as a domain member and rebooted before trying to promote it to a Domain Controller.

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