I can no longer connect with ssh to my Turris Omnia (OpenWrt omnia 15.05 r47055). I had set up LuCI and ssh access in the past using just Foris, but those settings must have stopped working for some reason in the meantime. The router has auto updates and auto reboots enabled and does both on regular basis. Today I had to re-enable LuCI/ssh access in Foris (99.1) and I can log into LuCI, but cannot use ssh due Too many authentication failures response from sshd.
Ok, it looks like ssh root password authentication does not work by default any more and I had no .ssh/authorized_keys file. Had to do lots of gymnastics in LuCI with custom web commands to add my public ssh key and luckily it worked!