Yandex checks the SSL/TLS certificate on the site and reports problems, including chain and validity issues that browsers may tolerate but crawlers do not.
What gets flagged
- Expired or soon-to-expire certificates.
- Incomplete chains — the most common real fault.
- Hostname mismatches on subdomains or the www form.
Why it matters beyond security
A certificate the robot cannot validate can block crawling entirely, which looks like an indexing problem rather than a certificate one.
Alien Road
Comment nous l'appliquons
Incomplete chain is the finding we see most: valid in a desktop browser, invalid to anything that does not fetch intermediates for you. It takes minutes to fix and it removes a whole class of mysterious crawl failures.
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