strange nginx error log file: connection to a private ip from a public ip

admin

On a vps I have configured a vpn (wireguard) where the IP is 10.6.6.100.

I found this strange log on nginx error.log:

2023/11/01 03:52:22 [error] 2821800#2821800: *135455 open() "/usr/share/nginx/html/KghB" failed (2: No such file or directory), client: <a public IP omitted>, server: 10.6.6.100, request: "GET /KghB HTTP/1.1", host: "<an host omitted>"

the IP is for sure used by a script scanning tool.

how it is possible that it was able to contact the server on the private IP used by the vpn (10.6.6.100) ?

Thanks for the help

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