Dropbear SSH integrity error

[Matt Johnston]

On Thu, Nov 12, 2015 at 10:28:27AM +0100, Zbynek Michl wrote:
> Hello,
> 
> I have a problem with SSH connection from my Ubiquiti AirOS device to
> a Mikrotik router.
> I use AirOS v5.5.11 (Dropbear SSH client v2013.58) and Mikrotik's
> RouterOS version 6.33 (also older versions have the same problem).
> 
> # ssh demo at demo.mt.lv
> ssh: Connection to demo at demo.mt.lv:22 exited: Integrity error (bad
> packet size -22146333)

It looks like ROSSH doesn't support "kex first follows".
Commenting out USE_KEX_FIRST_FOLLOWS in sysoptions.h will
fix that. Could you report it to Mikrotik? Github used 
libssh which had the same issue, fixed in libssh 0.7

Cheers,
Matt