So, I do an annual update to one of my software products. Last January
the FTP function worked fine.

Same settings, same machine, now Error 0 again.
I actually gave up in 2015 and didn't even try FTP for a few years. I
think I started using it again late 2018-early 2020 because it was
working. Now it's not again !

I can use FileZilla and it works.
I compiled the Nettalk NetDemo app and it works.

Any ideas?

Paul MacFarlane