As a safeguard for reflection attacks, Microsoft has disabled loopback access to websites on the actual server that is hosting the site when attempting to access with something other than the DNS FQDN (i.e. "localhost" or "hostname of server"). However, it works when the site is accessed externally from another computer. To fix this so that you may access the site from the server, do the following:
Configure the registry settings as prescribed in the following reference links:
- Ensure that the Internet Options settings of Internet Explorer are using the same protocols as are enabled or disabled on the server. For instance, if the server has TLS 1.0, SSL 2.0, and SSL 3.0 disabled, uncheck TLS 1.0, SSL 2.0 and SSL 3.0 in the Internet Options settings of Internet Explorer. Close the browser and then re-open. Attempt again.