We needed to apply a fix to curve25519-sha256 key exchange supplied by
upstream, but that involved disabling that key exchange method for
unpatched 6.6 and earlier versions. OpenSSH 6.7 will fix this when it's
released, but in the meantime I suggest applying the same patch to your
homebrew client
** Attachment added: Output of ssh -v -v server
https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1322892/+attachment/4119042/+files/ssh_log.txt
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