Problem installing mod-rpaf for apache2

Hello, I use a proxy server for my mail server. For some script I got the errors: Nginx <-> Apache ERROR $_SERVER[SERVER_ADDR] == $_SERVER[REMOTE_ADDR], please, contact hosting support. You are behind proxy. This is not an error if you really use proxy. In other case check your SERVER settings. If you use nginx - check WIKI article 'nginx' Please resolve the problem with rpaf mod so that I see the client’s real IP addresses instead of the proxy’s localhost address in Apache2’s log file. Thanks