Getting error "450 Transfer aborted. Link to file server lost"

0 votes
asked Jul 22 by Uwe Keim (1,070 points)

Connecting through FTP with SSL, our customer gets the following error message:

450 Transfer aborted. Link to file server lost

Here is the full log.

I'm rather clueless. Google did not show me any meaningful results.

Do you have any idea what could be the issue here?

Applies to: Rebex FTP/SSL

1 Answer

+1 vote
answered Jul 22 by Lukas Pokorny (111,330 points)
  • We have not seen this error yet. However, it actually comes from the FTP server, so it would be useful to check out corresponding entries in the server's log files, to see why it reported this error to the FTP client.

  • It looks like you use TLS 1.3 already. This is still a new protocol, and interoperability issues are still being sorted out, both by Rebex and other vendors. To determine whether this issue has anything to do with TLS 1.3, it might be useful to temporarily switch to TLS 1.2 to see whether this makes this issue disappear.

  • Additionally, it might be useful to try using the latest version of Rebex FTP/SSL, 2020 R3, with many improvements in the TLS 1.3 core.

commented Jul 22 by Uwe Keim (1,070 points)
Thanks a lot, Lukas, will do so.