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