Is this client's IP address blocked in iptables? If yes, this client may produce several password failures and Fail2ban invokes iptables to ban it.
Restarting iptables and Fail2ban service should fix it temporarily.
Is this client's IP address blocked in iptables? If yes, this client may produce several password failures and Fail2ban invokes iptables to ban it.
Restarting iptables and Fail2ban service should fix it temporarily.