SSL errors, mixed content warnings, DNS propagation issues, certificate expiry, Cloudflare misconfiguration — diagnosed and fixed quickly including SPF/DKIM for email deliverability.
A domain pointing to the wrong IP, a certificate not renewing automatically, or a Cloudflare configuration stripping SSL — these look simple but cascade into site-wide downtime, email delivery failures, and search engine penalties.
DNS changes often break email deliverability silently. I check and fix SPF, DKIM, and DMARC records — critical for avoiding spam folders and maintaining domain reputation after any DNS-level intervention.
Cloudflare expertise: Most SSL/DNS issues I see involve Cloudflare SSL mode set to "Flexible" instead of "Full (strict)". This causes redirect loops and security warnings that look complex but have a simple fix.