I run a backup script every night (using rclone v1.42) which syncs files from GDrive to an SFTP server. It ran smoothly for almost a year but since some weeks most script runs stop with fatal errors.
In the log file I see almost this type of error messages: ERROR : my/path: error reading destination directory: List failed: dirExists: couldn't initialise SFTP: ssh: unexpected packet in response to channel open: <nil>
Every month a copy job is also done which still runs smoothly rclone copy gdrive: sftpserver:backup -v --log-file=$LOGDIR/$NOW.log
On my site no changes were made to the setup. Perhaps the SFTP server of the backup provider behaves somewhat differently now. Do you have any hints to debug or solve this issue?
Yes, if the connection limit is 12, you definitely want to lower the checkers and transfers down to something smaller. That would be a great first step if you don't want to move up.
Since lowering transfers and checkers to 2 connections each, the last script runs happened without any error.
So it seems the backup server provider decreased the connection limit some weeks ago. But doesn't matter, even with the lowered settings the sync runs fast enough.