How to prevent unauthorized domain forwarding?

An unknown domain unauthdomain is forwarding (with masking) to our domain ourdomain.
The data, files, content are being served from our server even at folder levels. Any changes made to our pages is reflecting on their pages as well.

However, the URLs are showing as unauthdomain/folder1 instead of ourdomain /folder1.

We detected this issue when we got an alert in our Google Webmaster tools. We reported this to Cloudfront / Hosting provider and the same was removed after a few hours. However, now we have found 3 other unauthorized domains with the same forwarding/linking.

How do we stop these domains from spoofing our site? Can this be handled at domain DNS configuration level? If not, what changes should we do to server (We use Nginx) level to prevent such issues?

Please help.


I didn't find the right solution from the Internet.


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