Unable to setup multisite on nginx & php7.0-fpm

Hi all,

I am trying to solve this issue for few weeks to no avail :( I am trying to set up multiple websites in my Ubuntu 16.04 droplet by following this guide: https://www.digitalocean.com/community/tutorials/how-to-host-multiple-websites-securely-with-nginx-and-php-fpm-on-ubuntu-14-04

Problem is, domain1.com does NOT work (it shows empty pages), while domain2.com works fine.

I have this error and I do not know why:

$ php-fpm7.0 -y /etc/php/7.0/fpm/php-fpm.conf
[20-Apr-2017 16:48:28.895668] ERROR: pid 14360, fpm_sockets_new_listening_socket(), line 182: An another FPM instance seems to already listen on /var/run/php/php7.0-fpm-domain1.sock
[20-Apr-2017 16:48:28.895927] ERROR: pid 14360, fpm_init(), line 74: FPM initialization failed

These are the processes for php-fpm:

root     14272  0.0  3.1 364016 32140 ?        Ss   16:39   0:00 php-fpm: master process (/etc/php/7.0/fpm/php-fpm.conf)
domain1 14276  0.0  0.7 364008  7996 ?        S    16:39   0:00 php-fpm: pool domain1
domain1 14277  0.0  1.1 364392 11312 ?        S    16:39   0:00 php-fpm: pool domain1
domain2 14278  0.0  0.7 364008  7996 ?        S    16:39   0:00 php-fpm: pool domain2
domain2 14279  0.0  0.7 364008  7996 ?        S    16:39   0:00 php-fpm: pool domain2

and the sockets:

$ ll /var/run/php/
total 4
drwxr-xr-x  2 www-data   www-data  100 Apr 20 16:39 ./
drwxr-xr-x 26 root       root     1080 Apr 20 16:11 ../
srw-rw----  1 domain2 www-data    0 Apr 20 16:39 php7.0-fpm-domain2.sock=
srw-rw----  1 domain1   www-data    0 Apr 20 16:39 php7.0-fpm-domain1.sock=
-rw-r--r--  1 root       root        5 Apr 20 16:39 php7.0-fpm.pid

Nginx Configuration

server {
    # redirect www.domain.com to domain.com
    server_name www.domain1.com;
    return 301 $scheme://domain1.com$request_uri;
}
server {
        root /var/www/domain1/public_html;
        server_name domain1.com;
        #access_log /var/log/nginx/domain1.access.log;
        #error_log /var/log/nginx/domain1.error.log;

        location ~ \.php$ {
                try_files $uri =404;
                include fastcgi_params;
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                fastcgi_pass unix:/var/run/php/php7.0-fpm-domain1.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        }

        include global/common.conf;
        include global/wordpress.conf;
}

server {
    # redirect www.domain.com to domain.com
    server_name domain2.com;
    return 301 $scheme://www.domain2.com$request_uri;
}
server {
        root /var/www/domain2/public_html;
        server_name www.domain2.com;
        #access_log /var/log/nginx/domain2.access.log;
        #error_log /var/log/nginx/domain2.error.log;

        location ~ \.php$ {
                try_files $uri =404;
                include fastcgi_params;
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                fastcgi_pass unix:/var/run/php/php7.0-fpm-domain2.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        }

        include global/common.conf;
        include global/wordpress.conf;
}

# Global configuration file.
# ESSENTIAL : Configure Nginx Listening Port
listen 80;
#listen [::]:80;
# ESSENTIAL : Default file to serve. If the first file isn't found,
index index.php index.html index.htm;
# ESSENTIAL : no favicon logs
location = /favicon.ico {
    log_not_found off;
    access_log off;
}
# ESSENTIAL : robots.txt
location = /robots.txt {
    allow all;
    log_not_found off;
    access_log off;
}
# ESSENTIAL : Configure 404 Pages
error_page 404 /404.html;
# ESSENTIAL : Configure 50x Pages
error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/www;
    }
# SECURITY : Deny all attempts to access hidden files .abcde
location ~ /\. {
    log_not_found off;
    deny all;
}
# PERFORMANCE : Set expires headers for static files and turn off logging.
location ~* ^.+\.(js|css|swf|xml|txt|ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bm
p|rtf)$ {
    access_log off; log_not_found off; expires 30d;
}

# WORDPRESS : Rewrite rules, sends everything through index.php and keeps the appended query string intact
location / {
    try_files $uri $uri/ /index.php?q=$uri&$args;
}

# SECURITY : Deny all attempts to access PHP Files in the uploads directory
location ~* /(?:uploads|files)/.*\.php$ {
    deny all;
}
# Allow only internal access to .php files inside wp-includes directory
location ~* ^/wp-includes/.*\.(php|phps)$ {
    internal;
}
# REQUIREMENTS : Enable PHP Support
#location ~ \.php$ {
#    include snippets/fastcgi-php.conf;

    # SECURITY : Zero day Exploit Protection
#    try_files $uri =404;
    # ENABLE : Enable PHP, listen fpm sock
#    fastcgi_split_path_info ^(.+\.php)(/.+)$;
#    fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
#    fastcgi_index index.php;
#    include fastcgi_params;
#}
# PLUGINS : Enable Rewrite Rules for Yoast SEO SiteMap
rewrite ^/sitemap_index\.xml$ /index.php?sitemap=1 last;
rewrite ^/([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 last;

PHP-FPM Configuration

[domain1]
user = domain1
group = domain1
listen = /var/run/php/php7.0-fpm-domain1.sock
listen.owner = domain1
listen.group = www-data
php_admin_value[disable_functions] = exec,passthru,shell_exec,system
php_admin_flag[allow_url_fopen] = off
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
chdir = /

[domain2]
user = domain2
group = domain2
listen = /var/run/php/php7.0-fpm-domain2.sock
listen.owner = domain2
listen.group = www-data
php_admin_value[disable_functions] = exec,passthru,shell_exec,system
php_admin_flag[allow_url_fopen] = off
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
chdir = /

Does anyone know why this issue occurs? Thanks so much!