You're running Windows 10 and can't connect to a Netgear ReadyNAS device on the LAN
You can ping the ReadyNAS and you can access it via a web browser in order to manage it.
You're logged in to Windows 10 using a Microsoft account instead of a Windows Local account
Go into Control Panel and open Credentials Manager
Add the device name (e.g. ReadyNAS)
Add the device name and login name (e.g. readynas\user)
Add the password for the ReadyNAS user