on my Debian machines when I enter openssl -V I see the zlib algorithm.

On Ubuntu I do not have zlib support for openssl, so the SSH also not support zlib.

Why is this?

I tried several thing to get zlib support on Ubuntu for SSH but I failed.

Can anyone helpo me?

King Regards

  • What have you tried? You should just be able to add Compression delayed to your /etc/ssh/sshd_config. – EEAA Jul 22 '15 at 18:25
  • I tried "Compression yes" but openssl -V does not show zlib in the list. – Franz Jul 23 '15 at 6:24

OpenSSH links dynamically to zlib. You can see this by running ldd /usr/bin/ssh and looking for the libz.so.1 reference. The fact that OpenSSL does not show zlib does not mean that OpenSSH cannot use zlib.

  • ok, thanks but when I try to connect with my client I always get this error "negotiation failed" - thegeekstuff.com/2008/07/… Does this mean that the compression via SSH does not work properly? – Franz Jul 27 '15 at 9:47

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