did you tried to google what 502 error means ?
https://www.google.ro/?gws_rd=cr&ei=ZaSAU5KZCObk4QS49YG4Bg#q=502+bad+gat eway+ngin
http://www.nginxtips.com/502-bad-gateway-using-nginx
i think it's from the php5-fm sock or you need to open some ports/DNS servers not setup.
Last edited by DND; 24th May 2014 at 16:05.
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