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We run a wordpress blog in a subdirectory from our main domain.

domain.com => Server A (Nginx)
domain.com/blog => Server B (Apache)

The blog itself lies on a different (cheap shared hosting) server and gets reverse proxied.

Nginx => Apache

As every request to the blog gets tunneld trough our main server, Server B continuously blocks our Server A IP address, as all requests come from the same IP. If a lot of requests hit at the same time (mostly crawlers) we get blacklisted for 10 minutes and it results in a 502 bad gateway error.

Is there any way to pass the real IP address to Server B? Or knows somebody another solution, without upgrading to a root server? Hosting the wordpress blog on Server A is sadly not an option right now.

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1

If the "cheap shared hosting" supports it, you could forward the original requester IP:
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
So hopefully your reverse proxy's IP wont gets blocked.

If you want to block a list of bots you can check this question/answer out:
https://stackoverflow.com/a/24820722/940009

0

5 years late.

No. But you can block the crawlers?

if ($http_user_agent ~* bot)
{
    return 404;
}

Untested.

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