Question
How to use fail2ban for web login security behind loadbalancer
- Posted on July 11, 2023
- DigitalOcean Managed Load BalancersLoad BalancingWordPress
Asked by Clemens Nawroth
I am securing my wordpress login with fail2ban. Fail2ban reads the access logs and evaluates 403 messages - HTTP status header set by wordpress function status_header() - which are created whenever a login fails. Now the issue: since my site is behind a DO load balancer, all 403 errors are therefore associated with internal DO IPs.Is there any way to log the’real’ user IP instead of the one from the loadbalancer?
Best Clemens
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The outside client’s real source IP is in the X-Forwarded-For header. (Load Balancer reference)
Getting fail2ban to look at that header will involve making sure your HTTP server logs include that header, and then adjusting fail2ban to match on it.