Nginx "Server not found" while no network connection - nginx

Question

I'm using LEMP stack on Ubuntu 14.04 and have some trouble with nginx/1.10.0., when I have no network connection I can't reach my local sites just see "Server not found", but there is some thing interesting the localhost site still works fine in any network state. I have 5 local sites but only stock localhost works perfect in any network state.
I try many settings combination of my nginx, hosts file, also rename site directory, given any permissions to www folder but nothing helps, I don't know what to do else. Also I notice if I visit site while I'm online i can use site a while after I go offline, but if I open browser console and set mode "no cache" in same second I loosing connection with site and see again "Server not found", and last, in any mode of networking off/lan/wlan local site address pings good, there is no trouble.
There is no error message in logs, all perfect clear.
My config files almost the same for all sites, here it is.
My localhost nginx file
server {
charset utf-8;
client_max_body_size 128M;
listen 80; ## listen for ipv4
#listen [::]:80 default_server ipv6only=on; ## listen for ipv6
server_name localhost www.localhost;
root /home/arthur/www/localhost;
index index.php index.html index.htm;
location / {
# Redirect everything that isn't a real file to index.php
try_files $uri $uri/ /index.php?$args;
}
# uncomment to avoid processing of calls to non-existing static files by Yii
#location ~ \.(js|css|png|jpg|gif|swf|ico|pdf|mov|fla|zip|rar)$ {
# try_files $uri =404;
#}
#error_page 404 /404.html;
location ~ \.php$ {
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
#fastcgi_pass 127.0.0.1:9000;
fastcgi_pass unix:/var/run/php5-fpm.sock;
try_files $uri =404;
}
location ~ /\.(ht|svn|git) {
deny all;
}
}
my iamma.s nginx file
server {
charset utf-8;
client_max_body_size 128M;
listen 80; ## listen for ipv4
#listen [::]:80 default_server ipv6only=on; ## listen for ipv6
server_name iamma.s www.iamma.s;
root /home/arthur/www/iamma.s/web;
index index.php index.html index.htm;
location / {
# Redirect everything that isn't a real file to index.php
try_files $uri $uri/ /index.php?$args;
}
# uncomment to avoid processing of calls to non-existing static files by Yii
#location ~ \.(js|css|png|jpg|gif|swf|ico|pdf|mov|fla|zip|rar)$ {
# try_files $uri =404;
#}
#error_page 404 /404.html;
location ~ \.php$ {
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
#fastcgi_pass 127.0.0.1:9000;
fastcgi_pass unix:/var/run/php5-fpm.sock;
try_files $uri =404;
}
location ~ /\.(ht|svn|git) {
deny all;
}
}
nginx.conf
user www-data;
worker_processes auto;
pid /run/nginx.pid;
events {
worker_connections 768;
# multi_accept on;
}
http {
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
# server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
#mail {
# # See sample authentication script at:
# # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;
# }
#
# server {
# listen localhost:143;
# protocol imap;
# proxy on;
# }
#}
hosts file
127.0.0.1 localhost
127.0.1.1 Arthur-ProBook
127.0.0.1 phpmyadmin
127.0.0.1 my.s
127.0.0.1 iamma.s
127.0.0.1 www.iamma.s
127.0.0.1 inv.s
127.0.0.1 www.phpmyadmin
127.0.0.1 www.my.s
127.0.0.1 www.inv.s
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters