5 tutorials filed under Troubleshooting. Select “All” to see the full library.
SSH Permission denied (publickey) means no key was accepted. Diagnose it with ssh -v and the sshd log, fix 9 common causes, or get back in via the console.
Emails going to spam or bouncing with 550 5.7.26? Read the Authentication-Results header, build correct SPF, DKIM and DMARC records, and fix DMARC alignment.
Fix 503 Service Unavailable by finding the layer behind it: hosting resource limits, a full PHP-FPM pool, stuck WordPress maintenance mode or the CDN edge.
A 500 Internal Server Error means the app crashed and the cause is in the log. Read the logs, disable the broken plugin, and follow a 10-minute checklist.
Fix 502 Bad Gateway step by step: read the Nginx error log, restart PHP-FPM, catch the OOM killer and check Cloudflare. Work the funnel from the top.
With hourly billing you can build a server, practice on it and delete it, paying only for the few hours it ran. Estimate the exact cost with the pricing calculator before you sign up.
