unable to open active directory users and computers on server 2016

frankbustos
frankbustos used Ask the Experts™
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i was able to do it before and I created users but now when I try to open it I get this error attached. help
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Jose Gabriel Ortega CastroEE Rookie/Solution Guide/Topic Advisor and CEO Faru Bonon IT
Awarded 2018
Distinguished Expert 2018

Commented:
Enable IPv6 on card and try again.

jose
RobertSystem Admin

Commented:
Check the DNS settings on your server. Make sure it is pointed to a valid DNS server.
frankbustosSystems Administrator

Author

Commented:
ipv6 is enable and I checked dns settings and it's pointing to default gateway router.
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frankbustosSystems Administrator

Author

Commented:
is there service pack i need to apply?
Shaun VermaakTechnical Specialist
Awarded 2017
Distinguished Expert 2018

Commented:
Is the Active Directory service running?
frankbustosSystems Administrator

Author

Commented:
Yes active directory is running.
Jose Gabriel Ortega CastroEE Rookie/Solution Guide/Topic Advisor and CEO Faru Bonon IT
Awarded 2018
Distinguished Expert 2018

Commented:
frankbustosSystems Administrator

Author

Commented:
OK, so I decided to reinstall server 2016 which I did and then active directory worked fine. then I decided to move the server from the network and hooked it up to a 5 port switch which is not connected to the network and now active directory stopped working again.??? so once I've setup the server in one network I can't move it to another network???
RobertSystem Admin

Commented:
I am making the assumption that the server is not a domain controller.
The error basically means it cannot resolve Active directory domain services. Can you resolve the DNS to your domain controller from the other network. also check the firewall on the DC allows connection from the other network.
frankbustosSystems Administrator

Author

Commented:
hi Robert yes it is a domain controller and I created users under AD and once I moved it to just a switch I was no longer able to open AD.
RobertSystem Admin

Commented:
If the server in question does not have access to the other domain controllers then you would need to seize the FSMO roles on the server in question as it can no longer contact the role holders.
Just be sure to not plug it back into the a production network after doing so.
EE Rookie/Solution Guide/Topic Advisor and CEO Faru Bonon IT
Awarded 2018
Distinguished Expert 2018
Commented:
If you move it from one network to another, You need t o reset the Networking.
Meaning: IP, SUBMASK, GATEWAY and DNS set it into 127.0.0.1

Now in DHCP you need to change those values as well.
And you will be just fine.
No need to do anything else. but you need to configure the DNS and DHCP properly.
Test joining the computers to the domain and it should be just fine.
frankbustosSystems Administrator

Author

Commented:
Can I disable DHCP and DNS ON THE SERVER? I have a router who handles that. Let me know thanks
frankbustosSystems Administrator

Author

Commented:
This is crazy just because I moved to an isolated switch AD stops working and now the server takes up to an hour to login or restart ???
frankbustosSystems Administrator

Author

Commented:
So if I was to setup this server in a new office and they were to moved the AD would take a dump ??? Doesn't make sense
Jose Gabriel Ortega CastroEE Rookie/Solution Guide/Topic Advisor and CEO Faru Bonon IT
Awarded 2018
Distinguished Expert 2018

Commented:
DNS is a must of Active directory, so you just can't do that.
DHCP yes you can disable it but you need to enabled somewhere else 1st.

It doesn't have any sense to move AD to an isolated network or created it in one place to put it in another.
frankbustosSystems Administrator

Author

Commented:
thanks a lot all is working now

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