If Windows Update (or Microsoft Update) produces error code 0x80072EFD, you are most likely blocked by a firewall or a proxy.

• Check any firewall that may be blocking access to the update sites. This includes any software-based firewall on the server, as well as network firewalls and content filters.
• If you have configured a proxy, check whether the proxy is reachable and does not block access. If you don't have a proxy server (anymore), it may still be configured. See this article on how to check and resolve.