HTTPS Checker: What to Review on Your Website

A website can have a valid SSL certificate but still have HTTPS configuration problems that affect visitors. The most common example is an HTTP-to-HTTPS redirect that is either missing or misconfigured. If someone types your domain without 'https://', they should be automatically redirected to the secure version. Without this redirect, visitors on unsecured connections are not protected — and browsers may flag the site as not fully secure.

Another common problem is mixed content, where an HTTPS page loads some resources — images, fonts, scripts — from HTTP URLs. This creates a situation where the page is technically served over HTTPS but some content is still transferred insecurely. Modern browsers handle mixed content in different ways, sometimes blocking the insecure resources silently.

Certificate chain problems are less visible but equally important. A complete certificate chain includes your site's certificate plus the intermediate certificates that connect it to a trusted root authority. If intermediate certificates are missing, some clients — particularly on mobile or in certain network environments — may not trust the certificate even though it appears valid in a desktop browser.

A thorough HTTPS check covers: whether the certificate is valid and trusted, the expiry date and days remaining, whether the certificate matches the domain being accessed (including www vs. non-www), whether HTTP correctly redirects to HTTPS, whether the redirect chain is clean (not looping or making unnecessary hops), and whether the certificate chain is complete.

Security-conscious checks also review the TLS protocol version in use. Older TLS versions (TLS 1.0 and 1.1) are deprecated and disabled in most modern browsers, but some hosting configurations still advertise them. Using only TLS 1.2 or 1.3 is current best practice.

MonitorMojo's website health check includes HTTPS configuration review as part of the standard check — covering certificate validity, expiry timeline, and redirect behavior without requiring you to interpret raw SSL output.

HTTPS has been a Google search ranking signal since 2014. Sites that serve over HTTPS have a minor but real advantage over equivalent HTTP sites in organic search results. More importantly, Google Chrome marks HTTP sites as 'Not Secure' in the address bar — a label that many visitors interpret as a significant warning.

For sites that handle any kind of form submission — contact forms, newsletter signups, login credentials, payment information — HTTPS is essential. Without it, data submitted through forms is transmitted in plain text and can be intercepted on the network. Even for purely informational sites, the 'Not Secure' label undermines trust.

HTTPS also enables certain browser features — particularly service workers, which power offline functionality and push notifications — that are only available in secure contexts. For modern web applications, HTTPS is a prerequisite for full functionality, not just a trust signal.

The most frequent HTTPS mistake is partial redirect implementation. Many sites redirect https://www.example.com but not https://example.com, or vice versa. Visitors using either version should land on the same secure canonical URL. Having inconsistent redirect behavior creates duplicate content issues and leaves some visitors on insecure connections.

Another common mistake is allowing the old HTTP URL to serve content rather than redirecting. If http://example.com returns a page instead of a 301 redirect to https://example.com, you have two versions of your site accessible simultaneously — one secure, one not.

Hosting migrations frequently break HTTPS configuration. When a site moves from one server to another, the SSL certificate, redirect rules, and .htaccess or nginx configuration all need to be explicitly verified in the new environment. Assuming they transferred correctly is one of the most reliable ways to create a post-migration HTTPS problem.

• Missing HTTP to HTTPS redirect
• Inconsistent www vs. non-www redirect behavior
• HTTP version serving content instead of redirecting
• Redirect chain too long or looping
• Certificate valid but not matching domain (subdomain mismatch)
• Mixed content loading HTTP resources on HTTPS pages

HTTPS configuration should be explicitly verified after any of the following: hosting migration, domain transfer, CDN implementation or removal, content management system update, SSL certificate renewal, or adding a new subdomain. Each of these changes can silently affect HTTPS behavior in ways that are not obvious until a visitor reports a problem.

For agencies, a pre-launch HTTPS check is a sensible addition to any site deployment checklist. It takes minutes and catches the category of problems that most commonly appear in post-launch client feedback.

A post-migration HTTPS check is particularly important because the old site may have cached redirect rules or SSL configurations in your browser, making the new site appear healthy when it is not. Running the check from an external tool — separate from your browser and network — gives you an accurate picture.

HTTPS check results can look intimidating when presented as raw certificate data or HTTP response headers. The most useful monitoring tools translate these results into plain-language status summaries: the certificate is valid, expires in X days, the HTTP redirect is working, the certificate matches the domain.

For non-technical website owners, the key questions are: Is the padlock showing? Does the certificate cover my domain? When does it expire? Is the HTTP redirect working? A good HTTPS checker answers all of these without requiring you to read certificate authority chains or TLS handshake logs.

MonitorMojo presents HTTPS check results alongside uptime and response time in a format designed for non-technical owners and agency clients. You get a clear summary of what is healthy and what needs attention — and the output translates directly into client reporting if needed.