Bug 1834 – FTP file uploads are interrupting with TLS 1.3

Component: Core

Version: 5.16 beta

OS: Unspecified

Severity: Bug

Priority: Medium

Implemented/Fixed in: 5.17.4

Resolution: FIXED

Status: RESOLVED

Votes: 0

Description
2020-03-06 15:55

https://winscp.net/forum/viewtopic.php?t=28923

Comment #1
2020-03-06 15:55

Related to Bug 1831.

Comment #2
2020-03-06 16:43

Emails with Nestor Salvo and Christoph Probst.

Comment #3
2020-03-09 15:48

This might be ProFTPD problem:
https://forum.filezilla-project.org/viewtopic.php?t=50489&start=15

Comment #4
2020-03-09 15:50

The error manifests as:
"Transfer aborted. Link to file server lost"

As a workaround, you can limit WinSCP to TLS 1.2:
https://winscp.net/eng/docs/ui_login_tls

Comment #5
2020-03-09 15:50

https://winscp.net/forum/viewtopic.php?t=28998

Comment #6
2020-04-06 15:50

Emails with TJ Saunders.
Possibly an OpenSSL issue:
https://github.com/proftpd/proftpd/issues/959
https://github.com/openssl/openssl/issues/7948
https://github.com/openssl/openssl/issues/10880

Comment #7
2020-04-06 15:51

Emails with Felix.

Comment #8
2020-04-22 12:49

Fixed.

Comment #9
2020-04-23 07:47

https://github.com/winscp/winscp/commit/e78c2485a0e383b2a797b996fb330185f700e8d3

Comment #10
2020-04-24 09:23

https://github.com/winscp/winscp/commit/cf7a87cc32cc8e92008c0b0128a85cb8f9c1686a