Windows 10 で Windows Updateがうまく行かない件

There were some problems installing updates, but we'll try again later. If you keep seeing this and want to search the web or contact support for information, this may help: (0x80244007)

We couldn't get online to download your updates. We'll try again later, or you can check now. If it still doesn't work, make sure you're connected to the Internet.

接続先をかえると違うエラーメッセージなので、ネットワーク関係のトラブルなのだけど、理由わからず。