I recently upgraded from 220.127.116.11 to 18.104.22.168 to test some of the fixes to an issue I was seeing. Since then I’ve noticed that connections to my SFTP server are not closing after the backup completes. My assumption is that this has something to do with the changes for multiple connections to the target backup.
These open connections will stay open indefinitely (days) until I run out of allowed connections on my SFTP server and backups start failing. I’ve reduced asynchronous-concurrent-upload-limit down to 2 which seems to halve how many connections are left open after each backup.
From what I’ve observed, the backup starts and two connections are opened. As the backup continues two more connections are opened and there are 4 concurrent connections (despite being set at 2), and ultimately two of the 4 are closed and the remaining two are left open indefinitely.
I can do some more troubleshooting and try to figure out at exactly which stage things are happening if that helps but thought I’d see if anyone else has noticed the issue.