I have installed the latest version of weewx on a fresh RasberryPi and almost everything is working as expected.
I also have a different Pi running weewx 4.x. It's been running perfectly for years. I shut down weewx on that Pi. After everything is working, I can see the files getting created on the new 5.x Pi, in weewx.conf I turned on upload to WeatherUnderground and FTP to my GoDaddy hosted domain Strle.com. WeatherUnderground is getting through but the FTP to GoDaddy isn't.
the ftp section of the two Pi's are identical.
I set debug to 1, and restarted.
I used journalctl --since "2 hours ago" > \tmp\weewx.log to grab the log.
I looked through the log and didn't see anything related to FTP or FTP errors.
I reviewed the wiki and saw a section on additional logging but it looks like v4 code.