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Websites can not be accessed with error 502 Bad Gateway periodically with enabled fail2ban

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Renan Poss Moreira
Updated
Plesk for Linux kb: technical

Applicable to:

  • Plesk for Linux

Symptoms

  • Websites are periodically inaccessible with the following error shown in web browser:

    CONFIG_TEXT: 502 Bad Gateway

  • The following records can be found in the /var/log/fail2ban.log:

    # for i in $(plesk db -Ne "select ip_address from IP_Addresses"); do grep $i /var/log/fail2ban.log | grep Ban; done
    2021-06-07 11:52:15,036 fail2ban.actions [2591]: NOTICE [plesk-wordpress] Ban 203.0.113.2

Cause

An IP address used by the server is added to Tools & Settings > IP Address Banning (Fail2Ban) because the server IP is missing in the list of trusted IP addresses in fail2ban.

Resolution

Whitelist the banned server IP address.

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