Thanks! I will try to debug on my system and see if I can figure out why it would create multiple sessions.
There is an older related topic here that also mentions error 421 with FluentFTP .
That issue also details the multiple connections, so maybe the problem has been there for a while, but most people fixed it by using the FtpWebRequest based backend.
Edit: Also related issue:
The initial session used to retrieve a file list from remote FTP backup repository, right when backup starts for the first time isn’t properly closed or reused. Or maybe there is some specific reason for that?
I’ll check logs if it’s ever used for anything. I think it’s not. And it’s left open until it times out from the server side. Even backup completion doesn’t close the connection when program terminates. Which is quite strange.
I did run another backup, confirmed. The first session initia…