[Bug 1917045] Re: FTPS File upload fails with '450 Transfer aborted. Link to file server lost'

[Stephane]

I've also got this problem, and the workaround in the upstream's github
doesn't work because proftpd v1.3.6c doesn't actually know the TLSv1.3
configuration keyword.

Ubuntu 22.04 is also a no go because the package there is also 1.3.6c.

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https://bugs.launchpad.net/bugs/1917045

Title:
  FTPS File upload fails with '450 Transfer aborted. Link to file server
  lost'

Status in proftpd-dfsg package in Ubuntu:
  Confirmed

Bug description:
  When uploading files to the server I am receiving the error '450
  Transfer aborted. Link to file server lost'. Upon investigating it
  seems that this is a bug and has been fixed in the proftpd github:
  https://github.com/proftpd/proftpd/issues/959. The fix was applied to
  1.3.7 and back patched to 1.3.6d.

  The release notes for 1.3.6d can be found here:
  https://github.com/proftpd/proftpd/blob/1.3.6/RELEASE_NOTES

  I am currently running Ubuntu Server 20.04.

  proftpd-basic:
    Installed: 1.3.6c-2
    Candidate: 1.3.6c-2
    Version table:
   *** 1.3.6c-2 500
          500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages
          100 /var/lib/dpkg/status

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