Domain Controller Can't Be Reached

Question

I'm working with two new servers, both have Windows Server 2019 Standard installed. The servers are being added into a work environment that's never had servers before. I installed ADDS and DNS to SERVER-01 then promoted it to the PDC. That seemed to go perfectly. I installed ADDS and DNS on SERVER-02, but then when I attempt to add SERVER-02 to the new domain and promote it to BDC, I get an error message that says, "Server can't be reached."
I can ping SERVER-01 from SERVER-02, and ping SERVER-02 from SERVER-01.
The servers are on the same subnet.
SERVER-01 IP is 10.1.10.51.
SERVER-02 IP is 10.1.10.55.
I've tried turning off the Windows firewall but that doesn't help.
Any thoughts on why I can't add SERVER-02 to the domain that resides on SERVER-01?
Or why I can't promote SERVER-02 to a BDC?

Answer 1

On SERVER-01 remove the public DNS then do ipconfig /flushdns, ipconfig /registerdns, restart the netlogon service. Domain controller and members must use the static ip address of domain controller for DNS and no others such as router or public DNS

SERVER-01 also has an IPv6 address, possibly from router's DHCP server. If IPv6 is not configured correctly it will also cause problems. If this is the case I'd turn off the router's IPv6 DHCP function.

I did not look further at files since above issues are show stoppers. After corrections if problems 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

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

Answer 3

@Anonymous , thank you for your reply!! Here's the link:

https://1drv.ms/u/s!AgjYARWVQc2igidot29yVMycZcP4?e=Udefff

Answer 4

@Anonymous , that did the trick!!!!! Thank you, thank you, THANK YOU!!! I removed the public DNS and disabled IPV6, ran the DNS and netlogon commands and then everything just worked!!!

Answer 5

Glad to hear, you're quite welcome.