Hello Jeff Toben,
Thank you for your reply.
So you only have one forest with single domain and single Domain Controller?
Not sure if "cannot access domain the DC name" issue and "cannot join any pc to the domain" issue is caused by the same reason or not.
What error message did you receive when you join PC to domain?
1.You can check if all the ports that AD require are open or not .
Active Directory and Active Directory Domain Services Port Requirements
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/dd772723(v=ws.10)?redirectedfrom=MSDN
Active Directory Replication over Firewalls
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-2000-server/bb727063(v=technet.10)?redirectedfrom=MSDN
Especially, check the ports below.
Application protocol |
Protocol |
Ports |
Global Catalog Server |
TCP |
3269 |
Global Catalog Server |
TCP |
3268 |
LDAP Server |
TCP |
389 |
LDAP Server |
UDP |
389 |
LDAP SSL |
TCP |
636 |
RPC |
TCP |
135 |
RPC randomly allocated high TCP ports/ DCOM |
TCP |
1024 – 65535(windows server 2003/R2) <br><br>49152 – 65535(windows server 2008/R2 and later) |
SMB |
TCP |
445 |
DNS |
UDP |
53 |
DNS |
TCP |
53 |
Kerberos |
TCP |
88 |
Kerberos |
UDP |
88 |
Kerberos Password V5 |
TCP |
464 |
Kerberos Password V5 |
UDP |
464 |
NTP/SNTP |
UDP |
123 |
NetBIOS Datagram Service |
UDP |
138 |
NetBIOS Datagram Service |
TCP |
139 |
2.Run DCdiag /v on the DC to check if there is any error.
3.Run net share on DC to check if netlogon and sysvol is shared.
If you have any question or concern, please feel free to let us know.
Best Regards,
Daisy Zhou