Nginx upstream timed out

There are two main directives responsible for Nginx upstream timed out (110: Connection timed out) error:

proxy_read_timeout – Defines a timeout for reading a response from the proxied server. Default is 60 seconds.

location ~ ^/slow-proxy {
proxy_read_timeout 180; # <---
proxy_pass ...;
}

* you can use proxy_read_timeout inside http, server and location blocks.

fastcgi_read_timeout – Defines a timeout for reading a response from the FastCGI server. Default is 60 seconds.

.....
location ~ \.php$ {
fastcgi_read_timeout 180; # <---
fastcgi_pass ...;
}
.....

* you can use fastcgi_read_timeout inside http, server and location blocks.