root@DietPi3:~# journalctl -u dropbear.service
-- Logs begin at Thu 2019-02-14 11:11:58 CET, end at Tue 2020-10-27 16:03:49 CET. --
Oct 27 15:54:56 DietPi3 systemd[1]: Starting LSB: Lightweight SSH server...
Oct 27 15:54:56 DietPi3 dropbear[400]: Starting Dropbear SSH server: dropbear.
Oct 27 15:54:56 DietPi3 dropbear[405]: Running in background
Oct 27 15:54:56 DietPi3 systemd[1]: Started LSB: Lightweight SSH server.
Oct 27 15:58:43 DietPi3 dropbear[437]: Child connection from 192.168.x.x:52454
Oct 27 15:58:47 DietPi3 dropbear[437]: Password auth succeeded for 'root' from 192.168.x.x:52454
Oct 27 16:03:40 DietPi3 dropbear[573]: Child connection from 192.168.x.x:52674
Oct 27 16:03:49 DietPi3 dropbear[573]: Password auth succeeded for 'dietpi' from 192.168.x.x:52674
Pls let us know if a solution is working. This could help others if they hit by similar situation. Your DietPi Team