Seams that something is wrong with the php-fpm service.

Check your nginx and php-fpm logs.

tail -f /var/log/nginx/* /var/log/php*

This article should help you more.

Thank you for your reply.

Here is what I get when I run sudo tail -f /var/log/php*

[27-May-2015 07:38:19] NOTICE: configuration file /etc/php5/fpm/php-fpm.conf test is successful

And here is what I get when I runsudo tail -f /var/log/nginx/*
tail: cannot open ‘/var/log/nginx/*’ for reading: No such file or director

This is what I see when I open sudo vi /var/log/nginx/

access.log
access.log.1
error.log
error.log.1
.swp

Check if php5fpm process exist :

sudo ps aux | grep php5

Would it possible to paste your nginx config here. you can replace domain and sensitive info first

This is what I got when I typed sudo ps aux | grep php5

root      11842  0.0  1.4  79088  7524 ?        Ss   May27   0:04 php-fpm: master process (/etc/php5/fpm/php-fpm.conf)
username  13085  0.0  0.1  11740   932 pts/0    S+   07:27   0:00 grep --color=auto php5

I hope non of this info compromises my server.

Thanks

Any suggestion? I don’t want to give up that easy.