Is it useful to use Fail2Ban in this configuration? Should I monitor my Nginx reverse proxy or my Apache server ?
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If you are using Nginx as a reverse proxy I would assume you that’s what listening on port 80 and 443, correct?
If that is correct then use Fail2Ban on Nginx. Basically whatever is listening on port 80 and 443. Having said that to be completly sure, can you confirm what’s your exact setup, why do you have Nginx as a reverse proxy to Apache?