Guides from the NOC

Email bounced back with a strange SMTP code? Learn what 550, 552, 554, and 421 errors mean and the exact fix for each, from cPanel and WordPress mail.

Getting SSL_ERROR_RX_RECORD_TOO_LONG in Firefox? Learn why your browser thinks port 443 isn't serving SSL, and fix the Apache, Nginx or Cloudflare cause.

Getting a 400 Bad Request 'Request Header Or Cookie Too Large' error? Learn why it happens and how to clear it in the browser, WordPress, and on the server.

Getting a 413 Request Entity Too Large error on upload or import? Learn which layer - Nginx, Apache, or Cloudflare - is blocking it and how to fix each one.

MySQL table marked as crashed? Learn how to confirm it, repair it safely via phpMyAdmin or SSH with mysqlcheck, and stop it from happening again.

Site showing 503 Service Unavailable? Learn what's really crashing behind the scenes - PHP-FPM, Apache limits, plugins - and fix it step by step.

Emails bouncing or vanishing into spam? Learn how to check if your server IP is on a blacklist, get delisted fast, and stop it from happening again.

Site down behind Cloudflare showing error 521, 522, or 525? Learn what each code really means and how to fix the origin connection fast.

FTP connection refused, timed out, or 530 login failed? Learn the exact causes - wrong port, passive mode, quotas, key auth - and fix each one step by step.

Getting MySQL error 1040 Too Many Connections on your WordPress site or VPS? Learn how to diagnose the real cause and fix it safely, step by step.

Site stuck in a redirect loop or showing ERR_TOO_MANY_REDIRECTS? Learn the real causes - SSL mode, .htaccess, WordPress URLs - and fix each one step by step.

Seeing NET::ERR_CERT_DATE_INVALID or a mismatch warning? Decode the exact SSL error code and fix expired, mismatched, or mixed-content certificates fast.

Getting a 429 Too Many Requests error on your site or API? Learn what triggers rate limiting, how to diagnose the source, and the fixes that actually work.

Seeing a 500 Internal Server Error? Learn the real causes - .htaccess, PHP limits, plugin conflicts, mod_security - and fix each one step by step.