How to Fix "Could Not Connect to Server: Connection Refused" in psql
Running psql fails before you even get to a login prompt, with the connection actively refused rather than timing out or asking for a password. This means...
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How to Resolve "ERROR: Relation Does Not Exist" in Multi-Schema PostgreSQL
A query fails claiming a table doesn't exist, even though you can clearly see it when browsing the database. In a PostgreSQL database using multiple schemas,...
How to Fix "Nginx 502 Bad Gateway" Error With PHP-FPM or Node.js
Nginx returns a 502 error page instead of your application's response, which means Nginx itself is running fine but couldn't get a valid response from whatever...
How to Resolve "Nginx 413 Request Entity Too Large" Upload Error
A file upload that should work fails immediately with a 413 status instead of reaching your application code at all. Nginx rejects request bodies larger than...
How to Fix "Nginx 504 Gateway Time-out" on Long Running Requests
A request that takes a while to process — a report generation, a large data export, a slow third-party API call — fails with a 504 instead of eventually...
How to Fix "Nginx 403 Forbidden" Error on Static File Hosting
Nginx returns a 403 error for a static file you're sure exists and should be publicly accessible. Unlike a 404, this means Nginx found something at that path...
How to Resolve "Nginx SSL Certificate Error: x509: Certificate Signed by Unknown Authority"
A client connecting to your Nginx server over HTTPS rejects the certificate as untrusted, even though you're confident you installed a valid certificate from a...
How to Fix "Nginx proxy_pass Not Forwarding Custom Headers"
Your backend expects a custom header — an API key, a request ID, an Authorization token — but it never arrives, even though the client is clearly sending it...
How to Fix "Nginx Rewrite Rule Causing Infinite Redirect Loop"
A rewrite rule meant to redirect a URL ends up redirecting the browser back to itself over and over, until the browser gives up with a "too many redirects"...