The reason I am asking (before flagging the question)

DNS issue for internal website routing internet connection from remote location

got a comment from the OP

The problem is solved. ...
Turns out the previous admin had set up... The problem was that he didn't integrate it with AD...

On AskUbuntu this question would be closed as Off Topic because

This describes a problem that can't be reproduced, that seemingly went away on its own or was only relevant to a very specific period of time. It's off-topic as it's unlikely to help future readers.