Hi,
Agreed to you, my bad, the DNS update in my organization takes some time around 8 hours.
Absolutely, in my test PoC we can successfully migrate the IP address of checkmk and the GUI will work both with IP and server name.
Next step in my PoC would be to validate the checkmk agents and see how it behaves after changing the IP address of checkmk server.
We can close this discussion.
Thank you!!
BR
//Prachi