When an SSL certificate works the way it should, visitors move through a site confidently, and every connection stays protected. When something goes wrong, the experience can change fast. Common SSL certificate errors can confuse visitors and interrupt the trust you are trying to build. They can also block important site functions and impact performance.
Let’s dive into what SSL errors are, why they happen, the 12 most common ones, and how to fix them before they become major problems.
What is an SSL error?
An SSL (Secure Sockets Layer) error happens when a browser cannot confirm that a site’s SSL certificate is valid or configured correctly. The certificate acts like a digital ID that proves the site is secure, so any problem with that ID interrupts the connection. Visitors might see warnings that the site is not secure, which can lead them to click away before they reach your content.
Common SSL certificate problems and how to solve them
Understanding the most common SSL certificate issues makes it easier to spot what is going wrong and take action. Below, you’ll find explanations for the errors site owners run into most often, along with practical ways to resolve them.
1. Faulty installation
A faulty SSL installation happens when the certificate, private key, or intermediate files are not set up correctly on the server. This issue often appears during migrations or when switching hosting environments. Browsers cannot complete a secure connection when the installation is incomplete, which leads to warnings that turn visitors away.
You can fix this by:
- Confirming that the SSL certificate and private key match by checking the modulus.
- Reinstalling the certificate using your hosting control panel.
- Adding all intermediate certificates in the correct order.
- Restarting your server to apply updated configurations.
- Using an SSL checker to verify the chain after installation.
2. Expired or soon-to-expire certificates
An expired certificate blocks secure connections because browsers cannot verify that the site is still trustworthy. Once a certificate has expired, browsers display warnings because they can no longer verify that the site is trustworthy, which can hurt credibility and conversions. This may happen if you miss SSL renewal reminders, auto-renewal is disabled, your payment method fails, or the SSL certificate is installed but not replaced after renewal.
Here’s how to avoid this issue:
- Purchase or renew your SSL through your provider.
- Confirm that auto-renew is enabled.
- Install the new certificate before the old one expires.
- Verify the renewal through an SSL checker.
3. Name mismatch and SNI issues
A name mismatch happens when the domain in the certificate does not match the domain in the browser’s address bar. SNI (Server Name Identification) issues occur when multiple certificates on the same server are not handled correctly. These errors can happen if the SSL certificate was issued for the wrong domain, the site loads from both www and non-www without proper configuration, a subdomain is not included in the certificate, or your site is on an older server that does not support SNI.
Follow these steps to resolve name mismatch and SNI issues:
- Check whether the certificate covers the exact domain visitors use.
- Redirect all traffic to a single preferred domain.
- Reissue the certificate to include subdomains if needed.
- Enable SNI on the server, if available.
Related: How to improve domain name security
4. Untrusted certificate authorities and chain problems
Browsers warn users when a certificate authority (CA) is not recognized. Chain problems also appear when intermediate certificates are missing or out of order. These problems may arise when the SSL certificate was issued by an unknown or outdated CA, when intermediate certificates are missing, or when an incorrect installation order was used.
Luckily, these are easy problems to troubleshoot:
- Verify that your CA is trusted by major browsers.
- Install all intermediate certificates in the correct sequence.
- Reissue the certificate through a trusted CA if needed.
5. Mixed content warnings
Mixed content appears when a secure HTTPS (Hypertext Transfer Protocol Secure) page loads one or more HTTP (Hypertext Transfer Protocol) resources. Browsers block these elements because they create a weak point in the connection. Mixed content warnings may appear if old URLs are hard-coded as HTTP, third-party images or scripts load over HTTP, or your plugins don’t support HTTPS.
Here’s how to resolve mixed content SSL errors:
- Scan for insecure links using developer tools.
- Replace HTTP links with HTTPS versions.
- Update plugins or themes that load insecure assets.
- Enable automatic HTTPS rewriting if your host provides it.
6. HTTPS redirect issues
Redirect issues happen when traffic does not properly move from HTTP to HTTPS. This can cause redirect loops, broken pages, or Search Engine Optimization (SEO) problems. HTTPS redirect issues are usually a result of conflicting redirect rules, incorrect .htaccess or server config, or overlapping CDN (Content Delivery Network) and server rules.
You can fix this by:
- Enabling the host’s “Force HTTPS” option, if available.
- Checking your .htaccess or server configuration for duplicate rules.
- Updating your CDN settings to follow the preferred protocol.
- Testing redirects with a redirect checker.
7. Protocol and cipher errors
Protocol and cipher errors appear when the server and browser cannot agree on a secure protocol or encryption method. They are often triggered by outdated or weak SSL versions, ciphers, or server-level configuration.
To rectify these issues:
- Disable outdated SSL versions in the server configuration.
- Enable only modern TLS versions.
- Update cipher suites to the recommended secure sets.
- Restart the relevant web service (such as Apache or Nginx) to apply new settings.
8. Revoked or compromised certificates
An SSL certificate may be revoked if the CA detects a security issue. Browsers will then block your website because the certificate can no longer be trusted. Your SSL certificate may be revoked if the private key is exposed or stolen, there is a security breach involving certificate files, or the domain validation is incorrect.
You can troubleshoot a revoked or compromised certificate by:
- Generate a new private key.
- Reissue the certificate with updated validation.
- Remove old certificates from the server.
- Double-check server security to prevent future exposure.
- Change server passwords. Read this article on how to create strong passwords for more guidance.
9. Certificate transparency and compliance requirements
Certificate transparency (CT) logs and compliance checks help browsers detect suspicious or improperly issued certificates. When something is out of line, visitors see warnings that signal a trust issue. This error may be caused by missing CT logs, misconfigured Certificate Authority Authorization (CAA) Domain Name System (DNS) records, or outdated validation methods.
Here’s how to fix these issues:
- Confirm that your CA logs certificates to CT logs.
- Update CAA records to specify allowed issuers.
- Verify compliance with security standards, such as PCI compliance.
- Reissue the certificate, if needed.
10. Wildcard vs. multi-domain certificates
A wildcard certificate covers one domain and unlimited subdomains, while a multi-domain certificate covers several distinct domains. An SSL error can occur when site owners use the wrong type of certificate for their domain structure.
Follow these steps to avoid this problem:
- Review your domain setup and future plans.
- Choose a wildcard for subdomains under one domain.
- Choose a multi-domain certificate for separate domains.
- Reissue or upgrade the certificate when your domain structure grows.
11. Managing SSL for subdomains or multiple sites
Managing SSL across multiple subdomains or sites can get complicated when each one needs a certificate or has its own configuration. Errors may result from manual installations for each subdomain, incorrect wildcard or SAN (Subject Alternative Name) coverage, or misconfigured DNS or hosting settings.
This is a more complex issue that can be resolved through:
- Deciding whether a wildcard or multi-domain certificate fits your structure.
- Assigning each site the correct certificate.
- Confirming DNS records for each subdomain.
- Automating renewals to avoid missed updates.
Related: How to secure your ecommerce site
12. SSL with CDNs and cloud providers
CDN and cloud setups introduce additional layers that must all support SSL. When something is misaligned, browsers warn visitors that the connection is not secure. Issues may arise when your SSL is not enabled at the CDN level, there is a conflict between the CDN and the server's SSL, or there are incorrect origin settings.
You can rectify these SSL errors by:
- Enabling SSL in your CDN or cloud dashboard.
- Matching the SSL mode with your server configuration.
- Pointing the CDN to an HTTPS origin.
- Purging CDN cache after updating SSL.
- Testing the site through multiple global locations.
Best practices for SSL certificate management
Strong SSL management helps maintain trust, protect visitor data, and prevent unnecessary interruptions. These best practices give you a clear framework for managing certificates and staying ahead of potential problems.
Monitor and automate as much as possible
Consistent monitoring is one of the most effective ways to prevent SSL issues before they affect visitors. Automated tools can track certificate health, send alerts, and handle renewals so the process stays reliable. You should:
- Set up auto-renewal through your hosting platform whenever possible.
- Use automated reminders that alert you when a certificate is close to expiration.
- Monitor your SSL chain, protocol support, and configuration changes with security tools.
- Run regular checks on your site to confirm HTTPS is enforced.
- Review automated logs for early signs of misconfiguration.
For additional insight into renewal timelines, read this 90-day SSL certificate article.
Keep certificates and protocols up-to-date
Certificates, encryption protocols, and ciphers evolve, and keeping them current helps maintain strong protection for every connection. Don’t forget to:
- Renew certificates early and verify installation after each renewal.
- Update server configurations to support modern TLS versions.
- Remove outdated protocols and weak cipher suites.
- Audit your SSL setup at least once per quarter to flag potential issues.
- Confirm that new subdomains or domains are covered by your current certificate.
Learn how to get an SSL certificate here.
Team training requirements to avoid pitfalls
Even a small mistake can lead to security warnings, which makes team awareness an important part of SSL management. Training helps prevent common errors such as missed renewals, incorrect domain coverage, or accidental changes to server settings.
- Teach your team how SSL works and why correct configuration matters.
- Create a checklist for renewals and installations.
- Assign responsibility for SSL monitoring to specific team members.
- Review past SSL errors to help your team avoid repeating the same mistakes.
- Encourage consistent use of strong passwords and secure access controls.
When to seek expert help
Some SSL challenges require deeper technical support. Recognizing when to escalate an issue helps prevent long downtime, persistent warnings, or misconfigurations that affect multiple parts of your site. You may need expert help if:
- Trust errors continue after reinstalling or renewing a certificate.
- You manage a complex multi-domain or multi-site environment.
- You need guidance on advanced protocols or compliance standards.
- Your SSL must integrate with CDNs, load balancers, or cloud platforms.
- Security scans show chain issues or vulnerabilities you cannot resolve.
In these cases, reaching out to your hosting provider or security team is the best path forward. GoDaddy website security solutions can assist with installation, troubleshooting, and configuration to help keep your site secure and stable.
Why SSL/TLS certificates matter in 2026
Strong SSL and TLS protection continues to be a core requirement for every modern website. As security standards evolve and online threats grow more sophisticated, certificates play a vital role in keeping data safe and building user confidence.
There’s benefits for both websites and users
SSL certificates help create a secure connection that protects sensitive information and prevents attackers from tampering with site content. They also support better search visibility since major search engines favor secure sites. Most importantly, they give visitors confidence that your site can be trusted, which is a key factor in conversion and long-term engagement.
For a deeper look at how SSL works and how to choose the right option, explore this guide on SSL certificates.
