Once you have performed https://support.keriocontrol.gfi.com/hc/en-us/articles/360015179640-Modifying-Kerio-Control-Configuration-via-Serial-Console and you like to enable SSH as well but web admin somehow is not accessible execute following in the console
echo "RUN_SSHD=yes" > /etc/default/ssh
/etc/boxinit.d/31ssh start