If you are getting an error even in a web browser which says that there is an address mismatch, then it means you are trying to browse to
https://a.com, and the server certificate that gets returned indicates that the certificate is issued to "b.com". Since the name does not match, you see the error.
Ignoring server certificate errors are really not advised from a Windows Store app (or anywhere for that matter). Before suggesting solutions, I want to know:
1.) Why are you using a different URL that gives you a certificate for a different domain?
2.) Are you trying to browse to the site via IP Address or by a friendly name (www.abcd.com)?
3.) What class are you using to send your HTTPS request?
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