500 Internal Server Error
rewrite or internal redirection cycle while internally redirecting to "/error/403.html", client: 18.104.22.168, server: testlab.yocabe.it, request: "GET /favicon.ico HTTP/1.1", host: "testlab.yocabe.it"
Redirecting to /error/403.html is nominally correct (using ErrorDocument 404 /error/403.html?) but Apache does look first at the server's root directory so it may be necessary to change your absolute redirection from internal to external (http://www.example.com/error/403.html).
Except that isn't apache that is nginx.
It sounds like your server doesn't have permission on /error/403.html so it is getting an access denied error when throwning an access denied error. That said I don't actually see a question there.
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