[Bug 1528251] Re: WARNING: no suitable primes in /etc/ssh/primes

[Colin Watson]

Sorry, I mean OpenSSH in general of course, not just the client.

And yes, the other end ought to be able to cope with stronger primes.
But that's not what this bug is about: it specifically says "The alleged
problem is the reference to /etc/ssh/primes instead of /etc/ssh/moduli".

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https://bugs.launchpad.net/bugs/1528251

Title:
  WARNING: no suitable primes in /etc/ssh/primes

Status in openssh package in Ubuntu:
  Triaged

Bug description:
  
  For instance when the KexAlgorithms option in sshd_config is set to include Diffie Hellman group exchange (e.g. diffie-hellman-group-exchange-sha256), and the /etc/ssh/moduli file is regenerated to include only 4096 bit primes, the ssh server may log the above warning message to /var/log/auth.log, probably because the ssh client trying to log in does not allow for the use of 4096 bit primes during the key exchange. The alleged problem is the reference to /etc/ssh/primes instead of /etc/ssh/moduli. It would appear that the file /etc/ssh/primes is neither used by ssh server, nor documented.

  I note that this error appears to have been reported in several places
  on the web in the past years, but to no avail (e.g.
  http://misc.openbsd.narkive.com/tZPNEoZk/no-suitable-primes)

  
  Release: Ubuntu 14.04.3 LTS
  Package: openssh-server, Version: 1:6.6p1-2ubuntu2.3

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