👀 Views: 241 💬 Answers: 1 📅 Created: 2025-06-13

nginx php-fpm centos7 PHP

I've been struggling with this for a few days now and could really use some help. I've spent hours debugging this and I'm getting frustrated with I'm stuck on something that should probably be simple... I'm working with a persistent 502 Bad Gateway behavior when trying to connect Nginx to PHP-FPM on my CentOS 7 server. I've confirmed that both Nginx and PHP-FPM are running, but requests to PHP scripts consistently return a 502 behavior. The Nginx behavior logs show entries like: ``` 2023/10/15 14:52:04 [behavior] 12345#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.10, server: example.com, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "example.com" ``` I have checked my `nginx.conf` file and the relevant server block looks like this: ```nginx server { listen 80; server_name example.com; location / { root /var/www/html; index index.php index.html; } location ~ \.php$ { include fastcgi_params; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } } ``` I've also inspected my PHP-FPM configuration in `/etc/php-fpm.d/www.conf`, and it appears to be correctly set to listen on port 9000: ```ini listen = 127.0.0.1:9000 ``` Despite this, there are moments when PHP-FPM seems to stop responding. I’ve tried restarting both Nginx and PHP-FPM services multiple times: ``` systemctl restart nginx systemctl restart php-fpm ``` Additionally, I checked `/var/log/php-fpm/www-behavior.log`, but there are no notable errors logged there. I even attempted to increase the `pm.max_children` configuration in `www.conf`, thinking it might be a resource scenario: ```ini pm.max_children = 50 ``` Could this 502 behavior be due to some other underlying scenario? Any suggestions on further debugging steps or potential misconfigurations? Any ideas what could be causing this? This issue appeared after updating to Php stable. What am I doing wrong? I'm working in a Ubuntu 20.04 environment. Is this even possible?