How to Fix the “Connection Is Not Secure” Warning
A “connection is not secure” warning appears when a browser cannot verify that a website has a valid and correctly configured SSL certificate. The warning may be caused by an expired certificate, an incorrect domain match, missing HTTPS configuration, mixed content or DNS pointing to the wrong server.
The message should not be ignored on a website that collects passwords, contact details or payment information. Visitors may leave immediately, and browsers can restrict access to pages that do not provide a trusted encrypted connection. Use the following checks to identify the cause.
Understand What SSL Does
SSL, commonly discussed through HTTPS, encrypts information exchanged between a visitor’s browser and the website. It also helps the browser verify that the certificate was issued for the domain being visited. A certificate does not make a website immune to hacking, but it is an essential layer for privacy and trust.
The certificate must be valid for the exact host name. A certificate for example.com may not automatically cover a separate subdomain, and a certificate that covers the root domain may need to include the www version as well.
Check the Certificate Status
Open the hosting control panel or SSL management area and check whether a certificate is installed for the domain. Review its expiry date, covered host names and issuing status. If the certificate has expired, renew or replace it through the hosting provider or certificate authority.
If the certificate is newly issued, allow time for the installation process to complete. Verify both the non-www and www versions if the website supports both. A certificate that is installed on one host name but not the other can produce a warning only for certain visitors.
Confirm DNS Points Correctly
After a hosting migration or DNS change, the domain may still resolve to the old server while the certificate has been installed on the new one. Check the A, AAAA and CNAME records and confirm that they point to the intended hosting environment.
An outdated AAAA record can be overlooked when the A record looks correct. If some visitors reach a different IPv6 server, they may see an invalid certificate or an old version of the website. DNS changes can also take time to appear across different networks.
Force HTTPS Correctly
A valid certificate does not automatically force visitors from HTTP to HTTPS. Configure a permanent redirect so requests to http:// are sent to https://. WordPress users should also confirm that the WordPress Address and Site Address use the correct HTTPS version.
Test the redirect carefully to avoid loops. A redirect loop may occur when the server, reverse proxy and application each believe the other is responsible for HTTPS. Check the final URL in a private browser window after changing the setting.
Fix Mixed Content
Mixed content occurs when an HTTPS page loads an image, script, stylesheet, font or embedded resource through HTTP. Browsers may block some insecure resources or display a security warning even though the main page has a valid certificate.
Search the page source and browser console for HTTP resources. Update hard-coded URLs to HTTPS, review theme and plugin settings and replace outdated embeds. If a third-party resource does not support HTTPS, find a secure alternative instead of forcing visitors to load it insecurely.
Clear Cache and Test Again
Browsers, caching plugins and CDNs can retain an older certificate or redirect. Test in a private window and clear the relevant cache after making changes. Check the website from more than one browser or network to determine whether the problem is local or server-wide.
Do not use cache-clearing as a substitute for fixing the certificate. It is useful for confirming that a corrected configuration is visible, but it cannot repair an expired certificate or a DNS mismatch.
When to Contact Support
Contact the hosting provider when the certificate cannot be installed, automated renewal fails, DNS points correctly but the wrong certificate appears or server-level redirects conflict. Provide the exact domain, error message and steps already tested so support can investigate efficiently.
After the warning is resolved, test the homepage, login, forms, checkout, subdomains and important images. Confirm that the final URL is HTTPS and that no mixed-content errors remain.
Frequently Asked Questions
Why does my browser say a connection is not secure?
Usually the SSL certificate is missing, expired, issued for a different hostname or not configured correctly. Mixed content and DNS pointing to the wrong server can also cause warnings.
Can mixed content cause a security warning?
Yes. Images, scripts or other resources loaded through HTTP can make an HTTPS page partially insecure and may be blocked by the browser.
Does HTTPS protect a website from every attack?
No. HTTPS encrypts data in transit, but it does not prevent malware, weak passwords, vulnerable plugins or DDoS attacks. It should be combined with updates, backups and account security.