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My website is running on a domain (for example) www.mydomain.com. Now the problem is that abc.mydomain.com, xyz.mydomain.com etc. (*.mydomain.com) are pointing to the same website. We have a binding in IIS on port 80 for "All Unassigned". Is that binding causing the problem, or does this have something to do with DNS configuration?

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up vote 2 down vote accepted

You should create a CNAME record for *.mydomain.com which point to IP Address of your website. Then all request will be forwarded to your application IP Address. This is issue of your DNS provider.

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