Nginx sites-available doesn't work - nginx

Question

I've got this really simple server block under sites-available.
Problem: When I try to access to mydomain.com, Nginx returns a « 404 Not Found », but if I try to access to a file in particular, it works fine, like mydomain.com/index.php
server {
listen 80;
index index.php;
server_name mydomain.com;
root /home/myusername/sites/mydomain.com/htdocs;
access_log /home/myusername/sites/mydomain.com/logs/access.log;
error_log /home/myusername/sites/mydomain.com/logs/error.log;
location / {
try_files $uri =404;
}
location ~ \.php$ {
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
}
}
Note that:
my hosts file is configured ;
I restart Nginx after each edit ;
the access rights, user and group are correct ;
the error.log file is empty, the access.log returns me all the 404 ;
I tried to change the config by adding/removing some lines, still no changes ;
the site is enabled in sites-enabled with a correct symlink (I tried to edit it and it opened the right file) ;
I've got a few sites on the same server who runs well (so the including of sites-available and sites-enabled is OK, and Nginx works fine).

Answer 1

So, the answer was giver to me on ServerFault by Alexey Ten, here is a copy of the answer
Your try_files directive is too restrictive and, I guess, is in wrong place.
Either remove location / completely, it doesn't makes much sense, or, at least add $uri/ so index directive will work.
try_files $uri $uri/ =404;
But my guess is, you need to move this try_files into location ~ \.php$, this will make sure that php-file exsists before pass it to PHP-FPM for processing. All other files will be served by nginx with proper use of index directive.
server {
listen 80;
index index.php;
server_name mydomain.com;
root /home/myusername/sites/mydomain.com/htdocs;
access_log /home/myusername/sites/mydomain.com/logs/access.log;
error_log /home/myusername/sites/mydomain.com/logs/error.log;
location ~ \.php$ {
try_files $uri =404;
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
}
}