Apologies for my late response. I am running different software now, but the 'bug' is still present. I can currently reproduce it as follows:
Server: openssh-server Version: 1:6.9p1-2ubuntu0.1, Architecture amd64 on Ubuntu 15.10 (wily) Client: Prompt 2 v2.5.2 (Build 23057) on IOS 9.2.1 (see https://panic.com/prompt/) My /etc/ssh/sshd_config mentions: > KexAlgorithms > [email protected],diffie-hellman-group-exchange-sha256 When my /etc/ssh/moduli is generated to contain only 4096 bit primes, and I log in from my iPad using Prompt 2, the server logs the following message in /var/log/auth.log: Mar 22 21:47:40 srv01 sshd[28876]: WARNING: no suitable primes in /etc/ssh/primes The file /etc/ssh/primes does not exist on the server system; neither is it mentioned in the (FILES section of the) sshd(8) manpage, which, incidentally, does mention /etc/ssh/moduli. - The above message is not logged in case /etc/ssh/moduli is generated to contain all of 2048, 3072 and 4096 bit primes. I hope the report is now as complete as it should be. In case I find other ways to reproduce the error, I will let you know. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssh in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1528251/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
