Not able to login new user to Windows Server

Question

Hi, I have a Windows Server 2012R2 setup with 3 PCS and 3 users routinely logging on to it, each from a separate PC (local network).
Let's call them User1, User2, User3. User1 logs on from PC1, User2 from PC2, and User3 from PC3.
User3 is no longer working out of the office, thus, from the server management I created User4.

What I am trying to achieve is to be able to use PC3 for User4.

For some reason, I can log in as User3, but when I select Other user, and input the credentials for User4 I get the following message:
We can't sign you in with this credential because your domain isn't available. Make sure your device is connected to your organization's network and try again. If you previously signed in on this device with another credential, you can sign in with that credential.
Thus, I am still using PC3 with User3, but I am unable to figure out what is going on to get User4 on board.

Does this sound familiar? I have searched for that quote, but I have not found the thread addressing this particular circumstance.

Any help would be very much appreciated.

Jorge

Answer 1

Your domain controller (2012 essentials) has a DHCP assigned address appears to be coming from router. A domain controller must always have a static ip address. The domain controller and all members must use only domain controller address listed for DNS and no others such as router or public DNS. Setup the domain controller static. The router can be used for DHCP but it must not hand out router or public DNS, needs to changed to hand out the domain controller's static address for DNS. These issues are showstoppers so I didn't look at other files too much. After fixing these problems if issues persist then put up a new set of files to look at.

--please don't forget to upvote and Accept as answer if the reply is helpful--

Answer 2

Please run;

Dcdiag /v /c /d /e /s:%computername% >C:\dcdiag.log
repadmin /showrepl >C:\repl.txt
ipconfig /all > C:\dc1.txt
ipconfig /all > C:\dc2.txt
ipconfig /all > C:\dc3.txt
ipconfig /all > C:\problemworkstation.txt

then put unzipped text files up on OneDrive and share a link.