|Your post is incomplete.|
You say you have a windows server. Then you say site which indicates the server is either hosting a web site or acting solely as a web server..
You don't mention what you are pointed to for DNS which is a really vital piece of info.
Might want to compare what the working machine is pointed to for dns vs the nonworking machines.
Answers are only as good as the information you provide.
How to properly post a question:
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