To fix internet access for Kodi there is a very simple thing to do !

Go to your Settings/Services -> SMB client

And change its two parameters

Minimum protocol version :
Maximum protocol version :

By

Minimum protocol version : SMBv1
Maximum protocol version : SMBv3

Set the minimum SMB protocol version to negotiate when making connections. Forcing SMBv2 may be required to prevent SMBv1 use on some OS. Please be aware, that we do not recommend to use SMBv1 at all for security reasons as it's known vulnarable. So please enable SMBv1 only if you know what you are doing.

Source : https://kodi.wiki/view/Settings/Services/SMB_Client#Minimum_protocol_version