DNS on the Windows server is not case-sensitive. Also, changing uppercase to lowercase DNS records on Windows DNS is not easy because it is integrated with Active Directory. However, sometimes you may need to change a couple of records from uppercase to lowercase and vice versa to support the vSphere system (Linux is case sensitive).
In this example, I created a DNS hostname record named LinuxVM. Now, I want to change the record to linuxvm. If I delete the DNS record (LinuxVM) and recreate the DNS record (linuxvm), the previous DNS record is still appearing in the DNS record.
![](https://tungle.ca/wp-content/uploads/2022/06/image-32.png)
Below are a couple of steps that I have used to change the DNS record from uppercase to lowercase.
Step1: Delete the LinuxVM record
![](https://tungle.ca/wp-content/uploads/2022/06/image-38.png)
![](https://tungle.ca/wp-content/uploads/2022/06/3-1.jpg)
Step 2: Delete DNS entry on Active Directory
Open the adsi tool.
![](https://tungle.ca/wp-content/uploads/2022/06/image-33.png)
Right-click ADSI Edit – Connect to. Enter “DC=DomainDNSZones,DC=cisalab,DC=local” on the connection point”.
![](https://tungle.ca/wp-content/uploads/2022/06/image-34.png)
Go to ADSI Edit – Default naming context [DC1.cisalab.local]- “DC=DomainDNSZones,DC=cisalab,DC=local” – “CN=MicrosoftDNS” – “DC=cisalab.local”
![](https://tungle.ca/wp-content/uploads/2022/06/image-36.png)
Right-click the DC=LinuxVM entry and select “Delete”
![](https://tungle.ca/wp-content/uploads/2022/06/4.jpg)
Go to Active Directory Site and Service, and replicate configuration to the selected DC to make sure the “deleted DNS entry” is replicated to all domain controllers in the Active Directory.
![](https://tungle.ca/wp-content/uploads/2022/06/image-37.png)
Step 3: Recreate the record with a lowercase DNS entry
![](https://tungle.ca/wp-content/uploads/2022/06/image-39.png)
Checking the record is created on ADSI tool.
![](https://tungle.ca/wp-content/uploads/2022/06/6-1024x569.jpg)
Then, restart the DNS service and replicate the configuration to another DCs if needed.