I recently had my IP blocked by security software thinking it could be a brute force attach due to an incorrect password entered (Filezilla had a cached password on a site I was not even interacting with which further confused the issue).
I was in the middle of downloading two sites quite successful and then all of a sudden my websites appeared down, at least from the perspective of a web browser. I could ping all my sites, which confused me since a web browser was telling me otherwise. I did not think about traceroute at the time since it seemed my sites were up. Not realizing my IP was blocked, I even tried to SSH/Telnet without success. Finally I contacted support to report my sites were down. My site came up on its own or at least appeared so and so when I got a reply from support informing me of the IP block I asked about email notification for such things and was told it does not yet exist.
I’m thinking that a nice feature to add would be site owner email notification when it seems that a brute force was detected.