Okay the .master extension is just for the development, ASPX server and browsers can not render the content of it, It needs to have a content page first. My suggestion is make a blank page using that master file and use that to test in.
Quote:
Originally Posted by Corey Bryant
This type of page is not served.
Description: The type of page you have requested is not served because it has been explicitly forbidden. The extension '.master' may be incorrect. Please review the URL below and make sure that it is spelled correctly.
Requested URL: /MasterPage1.master
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That is because ASPX server and
IIS recognize it as source code and prohibit it.