SSH problem from Mikrotik to OpenWRT

Hi, we have some Mikrotiks routers connected on our city network and have detected some weird problem trying to access via SSH from the mikrotiks to a new OpenWRT based router recently connected.

When we try to access to the OpenWRT (OpenWrt Firmware Attitude Adjustment (r30750)) via SSH from the Mikrotiks (v5.14), we get this message:

[admin@Castalia] > /system ssh 10.228.168.169
DH_compute_key failed err: 102

Welcome back!

The same test from a Mikrotik v3.30 works perfectly:

[admin@CS-UJI-BiblAP] > /system ssh 10.228.168.169
admin@10.228.168.169’s password:

Maybe there’s any problem with the recent versions of RouterOS?

http://forum.mikrotik.com/t/ssh-to-client-device/52761/1

http://wiki.mikrotik.com/wiki/Manual:System/SSH_client#Log-in_using_certificate

http://wiki.mikrotik.com/wiki/Use_SSH_to_execute_commands_(DSA_key_login)