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I have recently upgraded the built-in OpenSSL to 3.0.0. All testing after upgrade was working fine but on reboot to finalize changes SFTP and SSH have failed to initiate. I was no longer able to re-connect to the server remotely, which was showing Network error. FTP was working fine, so I know the server have started successfully.

Any idea what might have happened?

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    I wonder where you got your OpenSSL 3.0.0, according to openssl.org/source the latest version is 1.1.1.
    – wurtel
    Jul 30, 2019 at 12:24
  • the openssl github repository link
    – Candy Ho
    Aug 1, 2019 at 1:05
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    That states that 3.0.0 is under development. Use a stable version if you can't handle problems with development versions yourself; there's a reason it's called a stable version.
    – wurtel
    Aug 1, 2019 at 6:55
  • I would have if the stable version was compatible with Hadoop that the server was being upgraded for. Besides, I had it working on Windows before. Just wasn't sure if it was AIX issue.
    – Candy Ho
    Aug 1, 2019 at 7:05
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    What version of Hadoop could possibly require OpenSSL 3.0.0, which last time I checked isn't even alpha quality yet? Aug 1, 2019 at 7:41

1 Answer 1

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So, after some digging and another SFTP server down issue, it was the fact that in addition to the OpenSSL upgrade, I have had to upgrade the OpenSSH too, as there were common modules that the old OpenSSH version was incompatible with. So it was a case of:

  1. Compile the new OpenSSL
  2. Compile the new OpenSSH pointing to the new OpenSSL
  3. Check the new packages are stable
  4. Install/Upgrade OpenSSL to the new version
  5. Install/Upgrade OpenSSH to the new version

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