Nginx + php-fm + Xcache + Memcached server problems

[gldtn]

Hello guys,

I've recently configured a LEMP environment on an ArchLinux VPS and I'm having problems with my websites where it's not always loading, specially images.

I'm running off of Linode (Linode 2048)

I have taken some screenshots;

I randomly get this while navigating through my Xenforo:
http://d.pr/i/QWqg
http://d.pr/i/pgxk
https://dl.dropbox.com/u/53690860/CM/error102.png

Or images won't load:
http://d.pr/i/FrJv
http://d.pr/i/FrJv

I currently turned off Xcache and Memcached to rule out caching problems, but no luck yet. It Also happens on my other non xenforo pages.

Any ideas? Your help is appreciated!
Thanks!

 

[gldtn]

It ended up being a problem with the limitation of my firewall iptables # HTTP IN/OUT + Prevent DoS Attack

Thanks!