[Bug 1528251] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From OFERBA at il.ibm.com 2016-03-20 08:36 EDT-------
i hit this error while using JSCH from java to connect to Ubuntu.

dpkg --list openssh-server
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                                  Version                         Architecture                    Description
+++-=====================================================-===============================-===============================-===============================================================================================================
ii  openssh-server                                        1:7.1p2-2                       s390x                           secure shell (SSH) server, for secure access from remote machines

hope this helps...
adding 1024 primes solved the problem but they should be shipped by default.

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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:
  Incomplete

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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