After a lot of investigation, it was my VPN (NordVPN) that was blocking my internet access. I removed the package, reinstalled, reconfigured and all works but now I cannot connect to my NAS from outside.
If I disconnect the VPN, it's okay.
It's weird because before, I had access to my NAS from the outside with the VPN.
I installed NordVPN following : https://support.nordvpn.com/Co…ary-OS-and-Linux-Mint.htm