Why is my domain not resolving?
Check if nameservers are updated at your registrar (dig yourdomain.com NS), verify the A record exists with the correct IP, flush local DNS cache, and wait for propagation (up to 24 hours). Use dnschecker.org to check global propagation.
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More FAQs in Domain Verification and Troubleshooting Fixing DNS and SSL Issues
Check DNS with dig yourdomain.com A +short (should return your IP), check HTTPS with curl -I https://yourdomain.com (should return 200), check SSL with openssl s_client, check global propagation with dnschecker.org, and test the API with curl https://api.yourdomain.com/api/health.
Check certificate validity with sudo certbot certificates. Renew if expired with sudo certbot renew. Ensure Nginx is configured for SSL (sudo nginx -t). The domain must point to your server before running certbot. If using Cloudflare, use DNS-01 challenge or temporarily disable proxy.
Ensure cookies are set with secure: true, sameSite: 'none' (requires secure), domain: '.yourdomain.com' (dot prefix for all subdomains), and httpOnly: true. The frontend must use withCredentials: true in Axios. All of these are required for cross-subdomain cookie sharing.
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