Bad Gateway - Nginx, Ubuntu 12.04 and Wordpress

I am new and learning how this work.. I just finish installing 3 Wordpress Sites + Nginx + PHP 5.4 in Ubuntu 12.04 on VPS..

My problem is it now gives me 502 Bad Gateway or sometimes i get server error 500. the WP sites only has 9 plugin and a theme.. nothing much more.. i cant find the problem..

Also would varnish help in speeding up and not cause conflict with nginx? as i dont plan to use any cache plugin..

Anyways, if someone can check my server then the better.. or point me to a toturial..

I am willing to pay but not much as i dont have much.. if anyone can find the problem and config my server to work at best with WP and speed.. also give me a small tutorial or a simple instruction follow..

 

I sent you a PM yesterday regarding this matter.

 

Already found someone.. thank you..

 

Hmm I just set this up for someone yesterday, was that you? Anyway I figure I will explain what it is that causes gateway errors when you are running nginx/php and not proxy. It is because it cannot connect to the php daemon which would have been fpm for you. IN nginx.conf or sites-enabled config for the site you have to establish the way it connects to php-fpm via sock, tcp and other parameters. With control panels like ispconfig it handles this for you when you add new websites so it is a big help. Without a control panel I will usually copy a working config and edit it for the new site, a lot easier to do it in control panel though

 

Possibly you need to try Varnish which is commonly used and efficient. This would get off the load from webservers and DB.

 

what do you mean? use varnish with nginx? or not?