This one comes in very handy at times.

Log onto the server and su – to become root.

To see what IPs are blocked type the following:

iptables -L -n

This will output the iptables list and at the bottom you will see the Chain fail2ban-SSH

Chain fail2ban-SSH (1 references)
target prot opt source destination
RETURN all -- 0.0.0.0/0 0.0.0.0/0

To remove the customer's IP from the block list type the following:

iptables -D fail2ban-SSH -s IP -j DROP

Switch the IP with the customer's public IP address.

This will remove the user from the block list and they should be able to access the dedicated server.

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