When updating to Windows 10, some new services are installed on your computer.
One of them use the default HTTP Kodi port 80, meaning that Kodi will no more be able to answer to queries.
Due to a bug in Kodi Isengard there's no errors in the logs or popups that will show you this problem.
But if you use port 80 and have problems then just change the port in Kodi to something else.
Windows 10 can also have change your network settings to be on public mode instead of private during upgrade.
You can change this settings in Windows network settings.
Of course do not forget to triple check your firewall settings.