I have two questions
I am trying to set fail2ban for mqtts (port 8883). On my server port 8883 is open for the world. The only, who have credentials for mosquitto, can connect and send data to my server. Now i have set the fail2ban for mqtts, but i dont know i can i test this, is it working or not!
I have another client, i wanted to send the data via this client to my server with wrong credentials and wanted to see if my server can block the IP of this client. But the problem is untill i dont provide the correct credential to my mqtts node (clien side) it cant dare to connect with server. Could you please tell me, how can i test this.
Is fail2ban useful for the servers that use only permit ssh keys authentication ??? I have verified that fail2ban works fine for password base authentication, but my server have ssh key based authentiaction. Is it make sense to install this fail2ban package, if i am using ssh keys already?