404 when Sagepay attempts to contact Cartthrob notification URL in Nginx

Question

https://xxx.xxx.xxx/themes/third_party/cartthrob/lib/extload.php

works fine, but

https://xxx.xxx.xxx/themes/third_party/cartthrob/lib/extload.php/sage_s

returns a 404.

My nginx server config is as follows:

server {
  listen 443 default_server ssl;
  ssl_certificate /etc/nginx/ssl/xxx_xxx_xxx.pem;
  ssl_certificate_key /etc/nginx/ssl/xxx_xxx_xxx.key;
  server_name xxx.xxx.xxx;
  root /sites/xxx_xxx_xxx/public_html;

  access_log /var/log/nginx/xxx_xxx_xxx-access.log;
  error_log  /var/log/nginx/xxx_xxx_xxx-error.log info;

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

  location @ee {
    rewrite ^(.*) /index.php?$1 last;
  }

  location ~ \.php$ {
    include /etc/nginx/fastcgi_params;
    fastcgi_pass unix:/var/run/php5-fpm.sock;
    fastcgi_index index.php5;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  }
}

Answer 1

try next config:

server {
  listen 443 default_server ssl;
  ssl_certificate /etc/nginx/ssl/xxx_xxx_xxx.pem;
  ssl_certificate_key /etc/nginx/ssl/xxx_xxx_xxx.key;
  server_name xxx.xxx.xxx;
  root /sites/xxx_xxx_xxx/public_html;

  access_log /var/log/nginx/xxx_xxx_xxx-access.log;
  error_log  /var/log/nginx/xxx_xxx_xxx-error.log info;

  location /themes/third_party/cartthrob/lib/extload.php { 
    rewrite ^(.*) /themes/third_party/cartthrob/lib/extload.php?$1 last; 
  }

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

  location @ee {
    rewrite ^(.*) /index.php?$1 last;
  }

  location ~ \.php$ {
    include /etc/nginx/fastcgi_params;
    fastcgi_pass unix:/var/run/php5-fpm.sock;
    fastcgi_index index.php5;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  }
}

Answer 2

Ensure your firewalls allow outbound Port 443 (HTTPS only) & inbound ports 443 (& optionally 80 HTTP) access in order to communicate with our servers (on Test/Live).

Check not a DNS issue if not receiving our (Sage Pays) Notification post.

What are the main differences between the two NotificationURLs?

When acknowledging Sage Pays notification post, when you send the Status, StatusDetail and RedirectURL, make sure you clear your response buffer to remove header code, comments or HTML as Sage Pay Server will expect "Status=" to be first characters in the response.