Ежедневно наблюдаю такую ситуацию
Feb 23 02:59:13 mail sshd[47740]: Invalid user abuse from 221.6.179.212
Feb 23 02:59:17 mail sshd[47743]: Invalid user adam from 221.6.179.212
Feb 23 02:59:21 mail sshd[47745]: Invalid user admin from 221.6.179.212
Feb 23 02:59:26 mail sshd[47747]: Invalid user admin from 221.6.179.212
Feb 23 02:59:30 mail sshd[47749]: Invalid user administrator from 221.6.179.212
Feb 23 02:59:34 mail sshd[47751]: Invalid user admin from 221.6.179.212