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The error shows up in error.log and the server suffers from multiple requests like this one.

FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 127.0.0.1, server: "attacker's ip", request: "GET /random characters.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "my server ip"

Kindly asking for help.

UserWarrior4321
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  • Check out this answer https://serverfault.com/a/849859/599646 . It describes how to configure Fail2Ban for what you need. – anemyte Jan 07 '21 at 12:58
  • Also, see the [Pitfalls and Common Mistakes](https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/#passing-uncontrolled-requests-to-php) document regarding Passing Uncontrolled Requests to PHP. – Richard Smith Jan 07 '21 at 14:04

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