Troubleshooting guides 282
Written so you can read a result and fix it. Search by symptom or error message.
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The site will not open
DNS_PROBE_FINISHED_NXDOMAIN, propagation delay
Mail bounces or lands in spam
SPF permerror, DMARC failure
A certificate warning
NET::ERR_CERT_*, missing chain
Redirects keep looping
ERR_TOO_MANY_REDIRECTS
I got a suspicious text
Parcel, fines, breach compensation, family impersonation
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Recently Updated
PHP2Shell: Check Your Server's PHP Version and Patch It On 21 October 2026 PHP fixed two flaws (CVE-2026-109618 and CVE-2026-109619) that allow remote code execution without logging in. Which releases fix them, how to check the PHP your server really runs, and what to do after updating. 403 Forbidden: Find What's Blocking the Request 403 Forbidden means a server or firewall refused the request. Find which layer said no, then fix permissions, missing index, deny rules, WAF or geo blocks. Chrome Warns Before HTTP Sites: Check and Fix Yours Now Since Chrome 154 (September 2026) Chrome shows a warning before opening a public site without HTTPS. Who is affected, how to check your sites, and how to fix them. Email Deliverability Setup: SPF, DKIM, DMARC, Sender Rules Set up SPF, DKIM and DMARC in the right order, meet the Gmail, Yahoo and Microsoft bulk-sender rules, and find out why authenticated mail still lands in spam. 405 Method Not Allowed: What It Means and How to Fix It 405 means the server knows the URL but refuses that HTTP method there. How to read the Allow header, find which layer answered, and fix the usual causes. SPF PermError: Too Many DNS Lookups (Over 10) Fixed Why SPF returns permerror past 10 DNS lookups, which terms count, a fixed example separating reference counts from sender evaluation, and the fixes that actually get you back under.