plugins

[bachy]

Hello,
thanks for the great app. I'm using it for months now without a problem.
Today i tried to add some plugins to etherpad-lite running npm install ep_adminpads then restarting EPL with systemctl restart etherpad-lite but none of the few plugins i tried seems to work.
I think it's not a matter of plugins or etherpad but of nginx config.
I have each time bad gateway errors and nginx logs show
2016/03/11 19:28:26 [error] 11129#0: *315 connect() failed (111: Connection refused) while connecting to upstream, client: 82.230.62.145, server: esadhar.net, request: "GET /pad/socket.io/?EIO=3&transport=polling&t=1457720906337-18 HTTP/1.1", upstream: "http://127.0.0.1:9001/socket.io/?EIO=3&transport=polling&t=1457720906337-18", host: "esadhar.net", referrer: "https://esadhar.net/pad/p/osp-usg-2016"

the etherpad-lite doc shows configuration with nginx wich i don't have in my /etc/nginx/conf.d/domain.tld.d/etherpadlite.conf
https://github.com/ether/etherpad-lite/wiki/How-to-put-Etherpad-Lite-behind-a-reverse-Proxy#from-subdirectory-url
i tried to add the location pad/socket.io {} block on my conf but then nginx failed to restart. I'm a rookie about nginx
could someone help me with this one ?
thanks