Errors - Rocketeers [ Rocketeers ](/) [Login](https://app.rocketeersapp.com) [← Back to knowledge](https://rocketeersapp.com/index%2ephp/knowledge) Errors ====== [### 403 Forbidden in nginx A 403 Forbidden means nginx found the resource but refuses to serve it. Almost always a file permission problem, a missing index file, or an explicit deny rule. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/403-forbidden-nginx) [### ERR\_TOO\_MANY\_REDIRECTS (redirect loop) This error means the browser was bounced between URLs until it gave up. The classic cause is a redirect loop between HTTP and HTTPS, very often a Cloudflare SSL setting fighting your server config. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/err-too-many-redirects) [### CORS error: No Access-Control-Allow-Origin header A CORS error means the browser blocked a cross-origin request because the server did not return the right headers. The fix is to send Access-Control-Allow-Origin from the API, not to disable browser security. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/cors-error-no-access-control-allow-origin) [### curl (60) SSL certificate problem: unable to get local issuer certificate This curl error means it could not verify the remote server certificate against a trusted root. Usually the local CA bundle is outdated or missing, not a problem with the remote site. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/curl-60-ssl-certificate-problem-unable-to-get-local-issuer-certificate) [### NET::ERR\_CERT\_AUTHORITY\_INVALID This browser error means the SSL certificate was not issued by a trusted authority, or the chain is incomplete. Usually a self-signed certificate, a missing intermediate, or an untrusted CA. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/net-err-cert-authority-invalid) [### SSL handshake failed in nginx (ERR\_SSL\_PROTOCOL\_ERROR) A failed TLS handshake means the browser and nginx could not agree on a secure connection. The top causes are an expired certificate and a missing intermediate chain. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/ssl-handshake-failed-nginx) [### 504 Gateway Timeout in nginx A 504 Gateway Timeout means nginx reached your application, but the application took too long to respond. Unlike a 502, the backend is alive, it is just slow. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/504-gateway-timeout-nginx) [### Your connection is not private This browser warning means the SSL certificate could not be validated. As a site owner it usually points at an expired certificate, a missing chain, or a domain mismatch you can fix on the server. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/your-connection-is-not-private) [### 502 Bad Gateway in nginx A 502 Bad Gateway means nginx reached your application but got an invalid response back. In almost every case the backend (PHP-FPM) crashed, never started, or is unreachable. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/502-bad-gateway-nginx) [### 503 Service Unavailable A 503 means the server is temporarily unable to handle the request. With Laravel it often means maintenance mode is on; on a busy server it means PHP-FPM has no free workers. 23 June 2026 · Errors](https://rocketeersapp.com/index%2ephp/503-service-unavailable) [### 413 Request Entity Too Large in nginx When uploading files you can encounter this error, which is caused by a limit in the nginx configuration. 22 January 2024 · Errors](https://rocketeersapp.com/index%2ephp/413-request-entity-too-large) [### Error in the HTTP2 framing layer Once in a while I got this error when connecting to an external service on servers running Ubuntu 18.x or 20.x. After some research I got this flaky bug resolved! 4 September 2023 · Errors](https://rocketeersapp.com/index%2ephp/error-in-the-http2-framing-layer)