I use nginx as proxy server.

nginx config

upstream nodejs__upstream {
server 127.0.0.1:3000;
keepalive 64;
}

server {
....
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_pass http://nodejs__upstream;
}
}

log4js logs: remote_addr shows 127.0.0.1

[2013-06-20 04:45:05.145] [WARN] [default] - 127.0.0.1 - - "GET / HTTP/1.0" 304 - "http://50.116.27.194:3000/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36"
GET /css/my.css 304 2ms
[2013-06-20 04:45:05.381] [WARN] [default] - 127.0.0.1 - - "GET /css/my.css HTTP/1.0" 304 - "http://moive.me/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36"

I print the remote address like this:

console.log("ip=>"+req.ip);
console.log("REMOTE_ADDR=>"+req.get['REMOTE_ADDR']);
console.log("HTTP_X_REAL_IP=>"+req.get['HTTP_X_REAL_IP']);
console.log("x-real-ip=>"+req.get['x-real-ip']);
console.log("x-forwarded-for=>"+req.get['x-forwarded-for']);

var headers = req.headers;
console.log("headers=>"+ (headers['x-real-ip'] || headers['x-forwarded-for']));
console.log("headers x-real-ip=>"+headers['x-real-ip']);
console.log("headers x-forwarded-for=>"+headers['x-forwarded-for']);

console.log("====================================================");

var proxy_ip=headers['x-real-ip'] || headers['x-forwarded-for']
if(proxy_ip) return console.log("proxy"+proxy_ip);
if(req.ip) return console.log(req.ip);

Proxy Test Result:

[2013-06-20 04:45:05.130] [INFO] console - ip=>127.0.0.1
[2013-06-20 04:45:05.130] [INFO] console - REMOTE_ADDR=>undefined
[2013-06-20 04:45:05.130] [INFO] console - HTTP_X_REAL_IP=>undefined
[2013-06-20 04:45:05.131] [INFO] console - x-real-ip=>undefined
[2013-06-20 04:45:05.131] [INFO] console - x-forwarded-for=>undefined
[2013-06-20 04:45:05.131] [INFO] console - headers=>114.252.83.33
[2013-06-20 04:45:05.131] [INFO] console - headers x-real-ip=>114.252.83.33
[2013-06-20 04:45:05.131] [INFO] console - headers x-forwarded-for=>114.252.83.33
[2013-06-20 04:45:05.131] [INFO] console - ====================================================
[2013-06-20 04:45:05.131] [INFO] console - proxy114.252.83.33
[2013-06-20 04:45:05.131] [INFO] console - req.ip127.0.0.1
[2013-06-20 04:45:05.131] [INFO] console - ====================================================

I try to update the log4js-node code in the log4js/lib/connect-logger.js line 118.

.replace(':remote-addr', req.socket && (req.socket.remoteAddress || (req.socket.socket && req.socket.socket.remoteAddress)))

to

.replace(':remote-addr',req.headers['x-real-ip'] || req.socket && (req.socket.remoteAddress || (req.socket.socket && req.socket.socket.remoteAddress)))

But it's does't wok. Can you help me ?

Thanks

Conan Zhang