DechoNet Guides https://dechonet.com/ Troubleshooting guides for IP, DNS, SSL, HTTP, and RDAP diagnostics. en Sat, 02 May 2026 11:52:19 GMT <![CDATA[301 vs 302 Redirect Guide]]> https://dechonet.com/guides/301-vs-302-redirect-guide.md https://dechonet.com/guides/301-vs-302-redirect-guide.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[403 Forbidden Checklist]]> https://dechonet.com/guides/403-forbidden-checklist.md https://dechonet.com/guides/403-forbidden-checklist.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[404 Not Found Root Cause Guide]]> https://dechonet.com/guides/404-not-found-root-cause.md https://dechonet.com/guides/404-not-found-root-cause.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[502 Bad Gateway Checklist]]> https://dechonet.com/guides/502-bad-gateway-checklist.md https://dechonet.com/guides/502-bad-gateway-checklist.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[503 Service Unavailable Checklist]]> https://dechonet.com/guides/503-service-unavailable-checklist.md https://dechonet.com/guides/503-service-unavailable-checklist.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[CDN Cache vs DNS Propagation]]> https://dechonet.com/guides/cdn-cache-vs-dns-propagation.md https://dechonet.com/guides/cdn-cache-vs-dns-propagation.md Fri, 06 Mar 2026 00:00:00 GMT dns <![CDATA[NET::ERR_CERT_COMMON_NAME_INVALID Fix]]> https://dechonet.com/guides/cert-common-name-invalid-fix.md https://dechonet.com/guides/cert-common-name-invalid-fix.md Fri, 06 Mar 2026 00:00:00 GMT ssl <![CDATA[DMARC Policy Guide: none vs quarantine vs reject]]> https://dechonet.com/guides/dmarc-policy-none-vs-quarantine-vs-reject.md https://dechonet.com/guides/dmarc-policy-none-vs-quarantine-vs-reject.md Fri, 06 Mar 2026 00:00:00 GMT dns <![CDATA[DNS_PROBE_FINISHED_NXDOMAIN Fix Checklist]]> https://dechonet.com/guides/dns-probe-finished-nxdomain-fix.md https://dechonet.com/guides/dns-probe-finished-nxdomain-fix.md Fri, 06 Mar 2026 00:00:00 GMT dns <![CDATA[Domain Migration Checklist]]> https://dechonet.com/guides/domain-migration-checklist.md https://dechonet.com/guides/domain-migration-checklist.md Fri, 06 Mar 2026 00:00:00 GMT general <![CDATA[ERR_SSL_PROTOCOL_ERROR Fix Guide]]> https://dechonet.com/guides/err-ssl-protocol-error-fix.md https://dechonet.com/guides/err-ssl-protocol-error-fix.md Fri, 06 Mar 2026 00:00:00 GMT ssl <![CDATA[HSTS Preload Checklist]]> https://dechonet.com/guides/hsts-preload-checklist.md https://dechonet.com/guides/hsts-preload-checklist.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[Mail Server Blacklist Removal Checklist]]> https://dechonet.com/guides/mail-server-blacklist-removal-checklist.md https://dechonet.com/guides/mail-server-blacklist-removal-checklist.md Fri, 06 Mar 2026 00:00:00 GMT dns <![CDATA[Nameserver Mismatch Diagnosis]]> https://dechonet.com/guides/nameserver-mismatch-diagnosis.md https://dechonet.com/guides/nameserver-mismatch-diagnosis.md Fri, 06 Mar 2026 00:00:00 GMT dns <![CDATA[Why Your IP Looks Like VPN, Proxy, or Cloud Hosting]]> https://dechonet.com/guides/public-ip-vs-vpn-proxy-check.md https://dechonet.com/guides/public-ip-vs-vpn-proxy-check.md Fri, 06 Mar 2026 00:00:00 GMT ip <![CDATA[Domain Expiry / Hold / Pending Delete Checklist]]> https://dechonet.com/guides/rdap-expiry-hold-pending-delete-checklist.md https://dechonet.com/guides/rdap-expiry-hold-pending-delete-checklist.md Fri, 06 Mar 2026 00:00:00 GMT rdap <![CDATA[Port 443 Closed Checklist]]> https://dechonet.com/guides/open-port-443-closed-checklist.md https://dechonet.com/guides/open-port-443-closed-checklist.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[Reverse DNS / PTR Setup Guide]]> https://dechonet.com/guides/reverse-dns-ptr-setup.md https://dechonet.com/guides/reverse-dns-ptr-setup.md Fri, 06 Mar 2026 00:00:00 GMT dns <![CDATA[Risky Open Ports Security Checklist]]> https://dechonet.com/guides/risky-open-ports-security-checklist.md https://dechonet.com/guides/risky-open-ports-security-checklist.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[TTFB / Compression / Cache-Control Checklist]]> https://dechonet.com/guides/site-speed-cache-compression-checklist.md https://dechonet.com/guides/site-speed-cache-compression-checklist.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[SPF Permerror: Too Many DNS Lookups]]> https://dechonet.com/guides/spf-permerror-too-many-lookups.md https://dechonet.com/guides/spf-permerror-too-many-lookups.md Fri, 06 Mar 2026 00:00:00 GMT dns <![CDATA[X-Robots-Tag noindex Fix Guide]]> https://dechonet.com/guides/x-robots-tag-noindex-fix.md https://dechonet.com/guides/x-robots-tag-noindex-fix.md Fri, 06 Mar 2026 00:00:00 GMT http <![CDATA[A/AAAA Record Troubleshooting Checklist]]> https://dechonet.com/guides/a-aaaa-record-check.md https://dechonet.com/guides/a-aaaa-record-check.md Thu, 05 Mar 2026 00:00:00 GMT dns <![CDATA[Cloudflare SSL Modes Explained — Off, Flexible, Full, Full (Strict)]]> https://dechonet.com/guides/cloudflare-ssl-modes.md https://dechonet.com/guides/cloudflare-ssl-modes.md Thu, 05 Mar 2026 00:00:00 GMT ssl <![CDATA[CNAME vs A Record — When to Use Which]]> https://dechonet.com/guides/cname-vs-a-record.md https://dechonet.com/guides/cname-vs-a-record.md Thu, 05 Mar 2026 00:00:00 GMT dns <![CDATA[DNS/SSL/HTTP Comprehensive Diagnostic Checklist]]> https://dechonet.com/guides/comprehensive-diagnosis.md https://dechonet.com/guides/comprehensive-diagnosis.md Thu, 05 Mar 2026 00:00:00 GMT general <![CDATA[Improve Email Deliverability — SPF, DKIM & DMARC Setup]]> https://dechonet.com/guides/email-deliverability.md https://dechonet.com/guides/email-deliverability.md Thu, 05 Mar 2026 00:00:00 GMT dns <![CDATA[HTTP Security Headers Guide]]> https://dechonet.com/guides/http-security-headers.md https://dechonet.com/guides/http-security-headers.md Thu, 05 Mar 2026 00:00:00 GMT http <![CDATA[Why Does My IP Address Change?]]> https://dechonet.com/guides/ip-change-reason.md https://dechonet.com/guides/ip-change-reason.md Thu, 05 Mar 2026 00:00:00 GMT ip <![CDATA[MX/SPF/DMARC Basic Checks]]> https://dechonet.com/guides/mx-spf-dmarc-check.md https://dechonet.com/guides/mx-spf-dmarc-check.md Thu, 05 Mar 2026 00:00:00 GMT dns <![CDATA[Redirect Loop Diagnosis]]> https://dechonet.com/guides/redirect-loop-diagnosis.md https://dechonet.com/guides/redirect-loop-diagnosis.md Thu, 05 Mar 2026 00:00:00 GMT http <![CDATA[RDAP vs WHOIS: Key Differences]]> https://dechonet.com/guides/rdap-vs-whois.md https://dechonet.com/guides/rdap-vs-whois.md Thu, 05 Mar 2026 00:00:00 GMT rdap <![CDATA[SSL Chain Missing / Domain Mismatch Fix]]> https://dechonet.com/guides/ssl-chain-mismatch.md https://dechonet.com/guides/ssl-chain-mismatch.md Thu, 05 Mar 2026 00:00:00 GMT ssl <![CDATA[SSL Expiry Operations Checklist]]> https://dechonet.com/guides/ssl-expiry-checklist.md https://dechonet.com/guides/ssl-expiry-checklist.md Thu, 05 Mar 2026 00:00:00 GMT ssl <![CDATA[DNS TTL Best Practices — Optimal Values for Every Scenario]]> https://dechonet.com/guides/ttl-best-practices.md https://dechonet.com/guides/ttl-best-practices.md Thu, 05 Mar 2026 00:00:00 GMT dns <![CDATA[Wildcard SSL Certificates — Setup and Pitfalls]]> https://dechonet.com/guides/wildcard-ssl.md https://dechonet.com/guides/wildcard-ssl.md Thu, 05 Mar 2026 00:00:00 GMT ssl <![CDATA[Why DNS Changes Take Time to Propagate]]> https://dechonet.com/guides/dns-propagation-delay.md https://dechonet.com/guides/dns-propagation-delay.md Tue, 03 Mar 2026 00:00:00 GMT dns