I’ve had T-Mobile home internet several months now. Having made it through several issues I’m glad I stayed with T-Mobile. Because T-Mobile maps IPV4 over IPV6, FTP did not work. To use FTP I had to subscribe to a VPN, turn it on when FTP was needed then turn off again. I’ve been using NordVPN for that. However, just now I attempted some file transfers and they worked! All my FTP logins work without using the VPN. This is wonderful.
So I’m wondering if anyone knows what changed. Was it T-Mobile? Was it something else? It isn’t the FTP servers or protocols or the internet in general. I use multiple FTP servers. So it has to be T-Mobile.