SSL Checker

An SSL checker inspects the TLS certificate that a website uses. The certificate ties a public key to one or more hostnames and is signed by a certificate authority. Browsers use it to confirm they are talking to the site named in the address bar and to encrypt the connection.

SSL is the older name for the protocol that became TLS. People still say SSL, and the checks are the same. The certificate proves the hostname and enables encryption, while the protocol version secures the exchange.

The tool usually reports:

• The hostnames covered by the certificate, including the subject and alternative names.
• The issuer and the validity period.
• Whether the certificate chain is complete.
• Whether HTTP redirects to HTTPS.
• Resources on the page that still load over HTTP.

The check fits the moments when a secure connection is new, changed or in doubt:

• After a certificate renewal. The new file may sit on one server and not on another.
• When adding a domain or subdomain. A certificate for the main domain may not cover www or a new subdomain.
• Before a campaign or launch. A warning page stops visitors before they see the offer.
• When a browser reports a problem. The checker names the failing test instead of leaving you with a generic warning.
• After a migration or CDN change. The new host may serve a different certificate or miss the redirect.
• On a schedule. Expiry is predictable, and a monthly check leaves time to renew.

A browser runs a quick series of tests, and a failure at any step ends in a warning screen.

1. The hostname. The certificate must name the exact host in the address bar. A certificate for the main domain may not cover the www host or a new subdomain.
2. The dates. The certificate must sit inside its validity period. A missed renewal turns every page into a warning.
3. The issuer. A trusted certificate authority must have signed it.
4. The chain. The server must send the intermediate certificates that link the site certificate to a trusted root. When one is missing, desktop browsers may cope while some phones and older clients fail.
5. The page itself. A perfect certificate cannot rescue a page that loads scripts or images over HTTP. Browsers may block the risky ones or mark the page as not fully secure.

Beyond the certificate. Mixed content happens when a secure page loads scripts, styles, fonts or images over HTTP. Hard coded addresses in old templates are the usual cause. Move every resource to HTTPS, then search the templates for leftovers.

Redirects matter too. Plain HTTP should send visitors to HTTPS in a single hop, with no loop. Google generally prefers the HTTPS version as the canonical one, but an invalid certificate or insecure dependencies can change that. A clean setup keeps the signals consistent.

Does HTTPS help SEO? Google recommends HTTPS for user and site security, and Chrome can mark HTTP pages as not secure. Google's public documentation does not present a certificate as a ranking boost, though. Treat an SSL checker as a security and trust tool and not a ranking tactic. The real gain is a connection visitors can rely on.

The aim of an SSL checker is a site where every public hostname presents a valid certificate, completes the chain and loads every resource over HTTPS.

That gives you:

• No expiry surprises on the domains that matter.
• A certificate that covers the apex, the www host and any active subdomains.
• A complete chain that works beyond the browser you happen to use.
• A clean redirect from HTTP to HTTPS, with no loop or extra hop.
• No mixed content warnings on key pages.
• A record you can attach to a security review or a client report.

It does not lift rankings on its own. The gain is a connection visitors can trust and a setup that does not undercut the rest of the page.

Why keep a checker in the toolkit?

• It verifies from the outside. The server configuration may look right while the public connection still fails.
• It shows the expiry date in plain text. There is no need to decode the certificate by hand.
• It explains the chain. A missing intermediate is easier to fix when the report names it.
• It covers host variants. Testing the apex and www separately catches a common mismatch.
• It checks the page, not only the handshake. Mixed content lives in the HTML, after the certificate has done its job.
• It is fast enough to run after every deploy. A minute now can prevent a warning page later.

The checker is a diagnostic, not a replacement for a renewal process. Pair it with automatic renewal and an expiry alert.

1. Enter the hostname into the Traffsite box, such as example.com or www.example.com.
2. Read the certificate summary first.
3. Confirm that the names listed cover the exact host you entered.
4. Check the issuer and the dates. Note the expiry date and set a reminder.
5. Review the chain. If an intermediate is missing, fix it at the server or CDN.
6. Confirm that the connection uses a current TLS version and that HTTP redirects to HTTPS.
7. Test the other host variants you use, scan a key page for mixed content and run the SSL checker again.

The tool suits anyone who runs a public website or the infrastructure behind it.

• Site owners who want to know that the padlock is real before a renewal lapses.
• Developers who deploy certificates and need to confirm the hostname and chain.
• System administrators and DevOps teams who manage several domains or a CDN.
• Security and compliance teams who need evidence of a valid, current certificate.
• Agencies that maintain client sites and want a quick check after a handover.
• Marketers who need a campaign landing page to open without a warning.

You do not need to understand cryptography to use the result. The report names the host, the dates and the failed check, and the fix is usually an installation or a renewal step.