What is 502 BAD GATE WAY nginx/1.4.6(Ubuntu) - error-handling

Question

How and why do I get this error? I have a Boost LG and I've never used nginx or Ubuntu or even heard of them until recently. Is someone accessing or running these in my phone? Please help and thanks a million

Answer 1

When you will find 502 Bad Gateway error :
Nginx running as proxy for Apache web server.
Nginx running with PHP-FPM daemon.
Nginx running with other services as gateway.
Bad buffering/timeout configuration.
Solutions :
Other quick solutions for 502 Bad Gateway error:
1) Increase buffer and timeouts inside http block:
http {
...
fastcgi_buffers 8 16k;
fastcgi_buffer_size 32k;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
...
}
2) Ensure your php-fpm service is listening according to what you’ve configured in nginx, it can be either this two options:
Edit www.conf file (in CentOS it is located at /etc/php-fpm.d/www.conf and try with one of this two options:
listen = /var/run/php5-fpm.sock
or
listen = 127.0.0.1:9000
After that, just restart the php-fpm service.
3) Disable APC Cache if used, instead try Xcache, apc can cause this kind of issues under particular enviroments causing segmentation faults.
4) I recently found another cause of 502 Bad Gateway error, check it out here: php5-fpm.sock failed (13: Permission denied) error