If it's definitely FTPS (as opposed to SSH-based SFTP) it looks like that needs ports 990 and 989.
You've already mostly discounted tethering as a cause. So it's probably either firewall or potential certificate-related. Does the working system have anything additional configured in terms of Certificate Authority? Compare / contrast /etc/pki/ca-trust/ between the systems.
Compare the output of `firewall-cmd --list-all` between the hosts.
You haven't said what error Filezilla gives when it fails to work. You might also want to compare the Filezilla logs between the working and failing system: https://wiki.filezilla-project.org/Logs
Or get command-line FTPS working in the hopes that it gives you clearer failure messages in the event that connections fail.
On Wed, 9 Oct 2024 at 14:27, Tim via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi,
Trying different PCs and different connections (and firewall
configurations) I can cause Filezilla to not be able to connect to a
FTP server outside my LAN on one of them when the PC is connected
through USB tethering on my mobile phone. Yet, another one works with
the same USB tethered phone.
It's a server that requires FTP over TLS. Does that scheme require any
special firewall tweaking on a client PC or any special networking
issues? I haven't managed to narrow down what's different one on from
the other.
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