fe.settings:getUserBoardSettings - non array given[os] - Endchan Magrathea
 >>/620/
Commenting out
SendEnv LANG LC_*
can help too.

Disabling pubkey auth is important. If you have passwordless key or have key loaded in ssh-agent, option
-oPubkeyAuthentication=no
disables pubkey auth completely.

Also, there's this thing to demonstrate deanon by ssh key:
https://github.com/FiloSottile/whosthere