Nginx troubleshooting guides
Use this path when Nginx is already installed but not behaving. It focuses on logs, failing upstreams, bad redirects, header problems, request limits, and the config checks that find the fault quickly.
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Nginx troubleshooting guides
32 matched guides, newest first. Page 1 of 3.
Nginx Access and Error Logs Guide
Nginx access logs and error logs remove guesswork when a site returns the wrong page, hides a static file, breaks a reverse proxy, or fails after a configuration...
How to Fix Nginx 504 Gateway Timeout Errors
An Nginx 504 Gateway Timeout error means Nginx waited too long for the next upstream step to complete. The upstream might be a reverse-proxied application, a PHP-FPM pool,...
Configure Nginx Upstream Load Balancing
Nginx upstream load balancing lets one public virtual host send traffic to two or more backend servers. It is useful when an application runs on several ports, containers,...
How to Fix Nginx 413 Request Entity Too Large Errors
Nginx returns 413 Request Entity Too Large when a client sends a request body that is larger than the layer handling the request allows. File uploads are the...
How to Create an Nginx Reverse Proxy
A reverse proxy becomes useful as soon as a local app needs a public domain, TLS, and one clean entry point. An Nginx reverse proxy gives private Node.js,...
How to Configure TLS Settings in Nginx
Default HTTPS snippets become hard to trust when Nginx inherits broad protocol lists from copied server blocks, Certbot includes, or hosting-panel templates. When you configure TLS settings in...
How to Configure Nginx PHP-FPM
Nginx does not execute PHP by itself. It serves static files directly and sends PHP requests to PHP-FPM through FastCGI. When that handoff is wrong, the symptoms are...
How to Configure Nginx Server Blocks and Virtual Hosts
Nginx server blocks let one Nginx service host multiple domains, subdomains, or applications from separate configuration blocks. Apache users often call this virtual hosting; Nginx documentation usually calls...
How to Restore Real Client IPs in Nginx Behind Cloudflare or a Reverse Proxy
Restoring real client IPs in Nginx becomes necessary when Cloudflare, a load balancer, a CDN, or an internal reverse proxy connects to the origin first. Without a trusted...
Nginx If Else Logic: Safe If, Map, AND/OR Patterns
Nginx conditionals become tricky when a configuration needs an else branch. The rewrite module provides if, but it does not provide else, else if, and, or or operators....
How to Fix Nginx 502 Bad Gateway
An Nginx 502 Bad Gateway error means Nginx accepted the client request but could not get a valid response from the upstream service. The upstream might be a...
Create Nginx Rewrite Rules with return and rewrite
Nginx rewrite rules are useful when a URL move needs more than a one-off redirect, but they can also cause loops, duplicate query strings, or open redirects when...