Guides
Checking HTTPS after a hosting or domain change
Check DNS, certificate coverage, redirects, page resources and renewal ownership when hosting or domains change.
THE READING ROOM
All articles
Practical explanations, troubleshooting and renewal guidance.
Troubleshooting
Finding certificate chain problems
Separate the certificates a server sends from the trust decisions a client makes, then locate missing intermediates or trust-store issues.
Troubleshooting
Diagnosing a certificate hostname mismatch
Compare the requested hostname with the certificate's SAN coverage, then trace DNS, virtual hosting and CDN configuration.
Troubleshooting
Troubleshooting an expired website certificate
Find the certificate visitors are seeing, separate failed renewal from failed deployment, and verify the repaired endpoint.
Automation
How ACME certificate automation fits together
Understand the client, certificate authority, validation method and deployment steps behind reliable ACME automation.
Automation
A practical certificate renewal plan
Build a renewal process that covers ownership, validation, installation and the certificate visitors actually receive.
Guides
Choosing a certificate for your website
Choose certificate management around your hostnames, renewal needs and support requirements, with free options treated fairly.
Guides
HTTPS, TLS and certificates: a practical map
Follow an HTTPS connection from browser to server, and see what certificates protect, what they do not prove, and who keeps each part working.