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CONTAP-688447: Scheduled config backup uploadFailed: POST/FTP path SIZE pre-check aborts on new files (regression in 9.16.1P12, 9.17.1P6, 9.18.1RC1+)

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Issue

After upgrading to ONTAP 9.17.1P6 or 9.18.1P1, scheduled configuration backup uploads to FTP destinations may fail. The backup archive is created locally, but the upload step terminates and the remote file is not created. Manual uploads to the same FTP destination (using the CLI) succeed, and multiple customers have reported the issue.
Typical indicators include an upload failure similar to:
mgwd: configbr.uploadFailed:error
Cannot upload to ftp://<server>/<path>/<file>.7z
Error: Remote file not found : The file does not exist
An FTP server trace commonly shows the session ending immediately after a SIZE request on the (new) backup filename:
[Command] SIZE <new-backup-file>.7z
[Response] 550 Couldn't open the file or directory
[Command] QUIT

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