sshd_config-ban ha kidobalod a gyengebb dolgokat Ciphers, MACs, KexAlorithms-bol, sok ezekbol nem jut el az elso probalkozasig sem, nalam ezzel van tele a log:
sshd[3591]: Unable to negotiate with 222.186.175.167 port 52364: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1 [preauth]
journalctl -S yesterday | grep -c 'Failed password'
24
journalctl -S yesterday | grep -c 'no matching key exchange method found'
1355