[Info-vax] problem conncting via ssh to Fedora-linux-server FC22

Dennis Boone drb at ihatespam.msu.edu
Mon Jun 1 11:40:29 EDT 2015


 > I recently upgraded one of my Fedora-linux servers from FC21 to FC22. 
 > After the upgrade I was not able to connect via ssh from my OpenVMS 
 > machines to this server (see log for connections to FC22 (failed) and 
 > FC21 (succeeded) below.) Connection from any of my linux servers is 
 > still possible.
 > It seems that something goes wrong when negotiating the ciphers.

>From the OpenSSH 6.7 release notes:

    Changes since OpenSSH 6.6
    =========================

    Potentially-incompatible changes

     * sshd(8): The default set of ciphers and MACs has been altered to
       remove unsafe algorithms. In particular, CBC ciphers and arcfour*
       are disabled by default.

       The full set of algorithms remains available if configured
       explicitly via the Ciphers and MACs sshd_config options.

You were previously using a CBC cipher.

Check the man page for sshd_config on the FC system to find the option
needed to put those back into play.

De



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