nginx+apache = 502 error

hello i have finished settupng my droplet with this article: https://digitalocean.com/community/articles/how-to-configure-nginx-as-a-front-end-proxy-for-apache, but after restarting their services i got 502 error - Bad Gateway.

netstat output: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 27867/mysqld tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 5846/nginx tcp 0 0 127.0.0.1:82 0.0.0.0:* LISTEN 5824/apache2 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 793/sshd tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 13573/php-fpm.conf) tcp6 0 0 :::4949 :::* LISTEN 24573/munin-node tcp6 0 0 :::22 :::* LISTEN 793/sshd

/etc/nginx/sites-enabled/myexamplesite config: server { listen 80;

    root /var/www/;
    index index.php index.html index.htm;

    server_name myexamplesite.com;

    location / {
    try_files $uri $uri/ /index.php;
    }

    location ~ \.php$ {

    proxy_set_header X-Real-IP  $remote_addr;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header Host $host;
    proxy_pass http://127.0.0.1:8080;

     }

     location ~ /\.ht {
            deny all;
    }

}

/etc/apache2/sites-enabled/myexamplesite config: <VirtualHost 127.0.0.1:82> ServerAdmin webmaster@localhost

    DocumentRoot /var/www
    <Directory />
            Options FollowSymLinks
            AllowOverride None
    </Directory>
    <Directory /var/www/>
            Options Indexes FollowSymLinks MultiViews
            AllowOverride None
            Order allow,deny
            allow from all
    </Directory>

    ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
    <Directory "/usr/lib/cgi-bin">
            AllowOverride None
            Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
            Order allow,deny
            Allow from all
    </Directory>

    ErrorLog ${APACHE_LOG_DIR}/error.log

    # Possible values include: debug, info, notice, warn, error, crit,
    # alert, emerg.
    LogLevel warn

    CustomLog ${APACHE_LOG_DIR}/access.log combined

Alias /doc/ "/usr/share/doc/"
<Directory "/usr/share/doc/">
    Options Indexes MultiViews FollowSymLinks
    AllowOverride None
    Order deny,allow
    Deny from all
    Allow from 127.0.0.0/255.0.0.0 ::1/128
</Directory>

</VirtualHost>

what is wrong here? it seems that request passes nginx to apache but than something goes wrong