@byman64 they added tls 1.3 in filezilla which pure-ftpd 1.46 doesn't support. Old filezilla client still works.
Yes, your are right... https://forum.filezilla-project.org/viewtopic.php?f=2&p=170271 it's a bit stupid remove the compaibility...now until I migrate to another client or I will find how to update pure-ftp I have to use plain ftp :-( something know if there is a way to update pure-ftp?
Had the same problems: https://www.howtoforge.com/communit...ould-not-connect-to-server.83362/#post-396802 Found out, that I had to re-check username on FileZilla FTP client (it somehow injected word "default" in the middle of username), AND had to re-type and save password on SERVER side for everything to work. Weird.
I know this is an older thread but perhaps somebody else stumbles over this. I ended up comparing the SSL libraries of a few of my ubuntu 18.04LTS server with some having this working and some not and the difference was I had the ppa ondrej/apache2 installed on those it was working which provides a newer version of libssl1.1. Once I added that PPA to the 'not working server' and ran `apt install libssl1.1`, the problem was gone.