Windows Server 2019

Question

Windows Server está mudando automaticamente o DNS das propriedades da rede coloco o IP da máquina no DNS no primário salvo e depois e alguns minutos é alterado por um outro de forma automática.

Colocando o ip 127.0.0.1 acontece o mesmo problema, antes havia colocado errado em DNS primário e secundário da operadora e agora fica somente ele o Windows deixa salvar outro porém depois volta para o que havia colocando anteriomente.

Como faz para fazer essa correção e Windows deixar salvar o DNS Primeiro como IP da máquina ou localhost e retirar esse da operadora que havia colocado de forma incorreta.

Answer 1

This is not an expected behavior from Windows Server by itself. When DNS settings revert automatically, something is enforcing or overwriting the configuration.

The most common causes are DHCP, Group Policy (GPO), or some management script/service. If your network adapter is set to obtain settings automatically, a DHCP server can push DNS values, and Windows will reapply them after a few minutes even if you change them manually.

Start by checking whether DHCP is enabled:

ipconfig /all

If you see “DHCP Enabled: Yes”, then the DNS is likely coming from the DHCP server. In that case, either fix the DNS settings on the DHCP scope or switch your server to a static IP configuration.

To prevent overwriting, set a static configuration:

ncpa.cpl

Open your network adapter properties, go to IPv4, select “Use the following IP address” and “Use the following DNS server addresses”, then set 127.0.0.1 or the server’s own IP.

If it is already static and still changes, check for Group Policy:

gpresult /h C:\temp\gpo.html

Open the file and look for any policies applying DNS or network settings. This is very common in domain environments.

You can also inspect and set DNS via PowerShell:

Get-DnsClientServerAddress

Set-DnsClientServerAddress -InterfaceAlias "Ethernet" -ServerAddresses 127.0.0.1

If the setting still reverts after that, then something external is enforcing it, most likely GPO, DHCP, or a management agent.

If this server is a Domain Controller, using 127.0.0.1 or its own IP as the primary DNS is correct. The real issue is identifying what is overriding your configuration, not the value itself.

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hth

Marcin