FTP TLS Connection Reset for Segmented Downloads

[AliveDevil]

TrueNAS Scale, ProFTPd
Synology NAS, SmbFTPd

Segmented Downloads from these servers (regardless of Single/Multiple connection) end up in Connection Reset.

cyberduck-tls.log

proftpd-tls.log

[dkocher]

Seems to be an issue with not reading the entire length of the file.

2025-01-29 12:08:03,873 [n0dlqjJU-transfer-1] WARN  ch.cyberduck.core.transfer.FailFastTransferErrorCallback - Cancel TransferItem{remote=Path{path='/mnt/NAS/homes/jmalek/vjunos-switch-23.1R1.8.qcow2', type=[file]}, local=Local{path='V:\Downloads\vjunos-switch-23.1R1.8.qcow2'}} with no pending file after failure BackgroundException{class=class ch.cyberduck.core.exception.BackgroundException, file=null, message='Connection failed', detail='Connection closed without indication.', cause='org.apache.commons.net.ftp.FTPConnectionClosedException: Connection closed without indication.'}

corresponding to error on the server

2025-01-29 12:08:07,630 mod_tls/2.9.2[469795]: TLSv1.2 data connection accepted, using cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits)
2025-01-29 12:08:08,448 mod_tls/2.9.2[469795]: panic: SSL_ERROR_SYSCALL, line 11104: system error: Broken pipe
2025-01-29 12:08:08,448 mod_tls/2.9.2[469795]: unexpected OpenSSL error, disconnecting

==> /var/log/proftpd/proftpd.log <==
2025-01-29 12:08:08,448 truenas-scale proftpd[469795] 127.0.0.1 (192.168.178.78[192.168.178.78]): mod_tls/2.9.2: unexpected OpenSSL error, disconnecting

==> /var/log/proftpd/tls.log <==
2025-01-29 12:08:08,453 mod_tls/2.9.2[469795]: [msg] sent TLSv1.2 warning 'close_notify' Alert message (2 bytes)
2025-01-29 12:08:08,453 mod_tls/2.9.2[469795]: [info] writing: SSL/TLS alert warning: close notify

==> /var/log/proftpd/proftpd.log <==
2025-01-29 12:08:08,454 truenas-scale proftpd[469795] 127.0.0.1 (192.168.178.78[192.168.178.78]): notice: user jmalek: aborting transfer: Data connection closed