unable to open active directory users and computers on server 2016

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
frankbustosSystems AdministratorAsked:
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Jose Gabriel Ortega CastroCEO Faru Bonon IT - EE Solution ExpertCommented:
Enable IPv6 on card and try again.

RobertSystem AdminCommented:
Check the DNS settings on your server. Make sure it is pointed to a valid DNS server.
frankbustosSystems AdministratorAuthor Commented:
ipv6 is enable and I checked dns settings and it's pointing to default gateway router.
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frankbustosSystems AdministratorAuthor Commented:
is there service pack i need to apply?
Shaun VermaakTechnical SpecialistCommented:
Is the Active Directory service running?
frankbustosSystems AdministratorAuthor Commented:
Yes active directory is running.
Jose Gabriel Ortega CastroCEO Faru Bonon IT - EE Solution ExpertCommented:
frankbustosSystems AdministratorAuthor 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 AdminCommented:
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 AdministratorAuthor 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 AdminCommented:
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.
Jose Gabriel Ortega CastroCEO Faru Bonon IT - EE Solution ExpertCommented:
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

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.

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frankbustosSystems AdministratorAuthor Commented:
Can I disable DHCP and DNS ON THE SERVER? I have a router who handles that. Let me know thanks
frankbustosSystems AdministratorAuthor 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 AdministratorAuthor 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 CastroCEO Faru Bonon IT - EE Solution ExpertCommented:
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 AdministratorAuthor Commented:
thanks a lot all is working now
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Windows Server 2016

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