kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ sudo journalctl --since "-5 min" --no-pager | grep "refused connect" | cat
Sep 12 09:14:42 sv1 telnetd[4642]: refused connect from 192.168.100.20 (192.168.100.20)