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Practical troubleshooting

Website Troubleshooting Guides

Research-backed guides for diagnosing DNS, SSL/TLS and HTTP problems. Each guide connects the explanation to a concrete check you can run.

DNS troubleshooting

DNS changed but site still points to the old IPSeparate authoritative DNS, recursive cache, A/AAAA, CDN routing and application behavior. DNS CheckerCheck A, AAAA, MX, TXT, CNAME, NS and CAA records with TTLs. DNS Propagation CheckerCompare DNS answers from independent recursive resolvers.

SSL/TLS troubleshooting

Renewed SSL but browser still shows the old certificateFind whether the stale certificate lives in the web server, SNI mapping, CDN, load balancer, DNS path or client. SSL certificate hostname mismatchDiagnose SAN coverage, wildcard limits, SNI and endpoint-routing errors. SSL CheckerInspect a verified public certificate, validity, issuer, SANs and expiry.

How these guides are written

Smart Web Utility guides are built around real troubleshooting intent rather than article-count targets. Protocol claims are checked against standards or authoritative vendor documentation, tool limitations are stated explicitly, and each workflow separates what a diagnostic result proves from what it does not prove.

New guide clusters are expanded from Search Console query evidence and observed user problems rather than publishing dozens of near-duplicate glossary pages.

See our Methodology & Editorial Standards for tool limitations, research rules, sourcing and correction practices.