I have a series of backups that run at scheduled times during the week. Backups locally have no problems whatsoever. Backups to a NAS unit always fail.
The NAS is on the same internal network and subnet at the server itself (no firewalls or routers)
The server connects to the NAS via FTP and always fails at the same 6 spots during the backup process. Where is fails in each case is during the FTP upload with this error:
Uploading archive to FTP server ..
.. upload failed! initial connection failed : Transfer aborted. Data connection closed.
Every step prior to upload reports no error.
The logfile on the NAS shows three attempts to upload the backup each incomplete:
/mnt/md1/backups/server/full/non-media/2010-09-17/mydomain.com.tar b _ i r server ftp 1 * i
This is a single scheduled backup with multiple domains and so the FTP credentials used to connect are the same from one backup to the next. So why would these routinely fail?
Also, the backups are only TAR with no compression.