Where the Concern Comes From

Between 2017 and 2018 the browser industry took an unusual step: Google Chrome, followed by Mozilla, announced it would progressively distrust SSL and TLS certificates issued by Symantec's certificate authority operation, including brands operating under it such as Thawte, GeoTrust and RapidSSL. The decision followed a series of misissuance incidents and compliance failures that undermined confidence in the validation process. Symantec eventually sold its certificate business to DigiCert, which reissued affected certificates from trusted infrastructure.

The result is that legacy Symantec certificates issued before that transition are no longer trusted by modern browsers. This is where the SEO question arises, and the answer needs to be precise. A distrusted certificate is not a ranking penalty in the algorithmic sense. It is something far more damaging: a hard browser interstitial that stops visitors from reaching your site at all, along with crawling and indexing complications that follow from an insecure or failing connection.

How AAMAX.CO Can Help With Your SEO

At AAMAX.CO we treat HTTPS configuration as core technical SEO rather than an IT afterthought, because certificate problems quietly destroy traffic. Our SEO services include full HTTPS audits covering certificate chain validity, expiry monitoring, mixed content detection, HSTS implementation, correct canonical and redirect handling across protocol variants, and verification that Search Console properties reflect the secure version of your site. We also handle migrations end to end so nothing breaks during the switch. As a full service digital marketing company providing web development, digital marketing and SEO worldwide, we can implement server level changes, not just report them. Hire AAMAX.CO to make sure trust, security and search performance stay aligned.

What Actually Happens With a Distrusted Certificate

When a browser encounters a certificate it does not trust, it does not display a subtle warning. It presents a full page security error telling the visitor the connection is not private and advising them to go back. The overwhelming majority of users leave immediately. Traffic collapses, conversions stop, and if the problem persists you begin losing rankings, not because of an SSL ranking factor but because the pages have become effectively unreachable, engagement signals crater, and crawlers encounter failures.

Search engines treat repeated fetch failures as a signal that content is unavailable. Over time affected URLs can be dropped from the index. Recovery requires fixing the certificate and then waiting for recrawl and reindexation, during which competitors absorb your visibility.

Is HTTPS Itself a Ranking Factor

Yes, but a lightweight one. Google confirmed HTTPS as a ranking signal in 2014, describing it as a tie breaker of modest weight. In practice HTTPS is now table stakes rather than an advantage, since virtually all competitive results are served securely. The meaningful consequences of getting HTTPS wrong are user trust, browser warnings, referral data loss, blocked access to modern browser APIs, and the technical debt of mixed content. Those matter far more than the small direct signal.

Importantly, Google does not care which certificate authority you use, nor whether your certificate is domain validated, organisation validated or extended validation. A free automated certificate from a trusted authority provides exactly the same ranking benefit as an expensive one. What matters is that the certificate is valid, correctly installed, unexpired and issued by an authority browsers trust.

Checking Whether You Are Affected

If your site still uses a certificate issued by legacy Symantec infrastructure before the DigiCert transition, it will already be failing in Chrome and Firefox, so the symptom is obvious. To verify your current position, inspect the certificate details in your browser to see the issuing authority, validity dates and chain. Run an external SSL test to confirm the full chain resolves correctly, that intermediate certificates are installed, and that outdated protocols and weak ciphers are disabled. Check Search Console for crawl errors and for a sudden drop in indexed pages. Test from multiple devices and networks, because a chain problem may appear on some clients and not others.

Also confirm there is no partial deployment: a valid certificate on the main domain but a missing or mismatched certificate on a subdomain, CDN edge or checkout host is a common and costly oversight.

Migrating to a Trusted Certificate

Replacing a certificate is routine work when handled methodically. Choose a currently trusted authority, whether that is DigiCert, a commercial alternative or an automated free provider such as Let's Encrypt via your host. Generate a new key pair and certificate signing request, complete validation, then install the certificate together with the correct intermediate chain. Restart or reload the web server and clear any CDN caches so edge nodes serve the new certificate.

After installation, verify the chain externally, confirm the certificate covers every hostname you serve including www and any subdomains, ensure automatic renewal is configured with monitoring and alerts, and check that HTTP requests redirect to HTTPS with a single 301 rather than a redirect chain. Then confirm canonical tags, sitemap URLs, internal links, hreflang references and structured data all point to the secure protocol.

Avoiding the Common Post Migration Mistakes

Mixed content is the most frequent issue: a secure page loading images, scripts or stylesheets over HTTP triggers browser warnings and can block resources entirely. Audit your source for hard coded HTTP references, especially in themes, ad tags and older blog posts. Redirect chains are the second problem, where a request passes through several hops before reaching the final URL, wasting crawl budget and slowing load. Third, forgetting to add the HTTPS property in Search Console leaves you blind to the data that matters. Fourth, letting renewal lapse recreates the entire outage from scratch, which is why automated renewal and expiry alerts are essential.

Practical Recommendations

Standardise on automated certificate management wherever your stack supports it, so human error is removed from renewal. Enable HSTS once you are confident every resource is served securely, and consider preloading only after thorough testing since it is difficult to reverse. Keep TLS versions current and disable deprecated protocols. Monitor certificate expiry, chain validity and mixed content continuously rather than annually. Treat any browser trust warning as a critical incident, because in traffic terms it is worse than a server outage: the site appears actively dangerous rather than merely down.

Conclusion

Symantec certificates are not bad for Google SEO in the sense of an algorithmic penalty, but legacy Symantec issued certificates are now distrusted by major browsers, and that produces a far more severe outcome than any ranking adjustment. Visitors are blocked by security warnings, crawlers encounter failures, and indexed pages eventually disappear. Migrate to a currently trusted certificate authority, install the full chain correctly, eliminate mixed content, automate renewal and monitor continuously. Do that and HTTPS becomes invisible infrastructure that quietly supports your search performance instead of threatening it.