Clear Local DNS Cache on Windows
In the search bar next to the Start button, search for cmd

Select Command Prompt

Within the prompt, type ipconfig /flushdns

Hit Enter; there should be a message stating Successfully flushed DNS Resolver Cache

Clear Local DNS Cache on Mac
Select Finder, click Go, and select Utilities

Select Terminal

On your local machine, open a Terminal Window
Within the prompt, type "sudo killall -HUP mDNSResponder && echo macOS DNS Cache Reset"
Hit Enter
Note:
There will be no message but at this time please reattempt connection to your domain. You may have to enter your admin password.