Learn how to fix SSL_ERROR_UNRECOGNIZED_NAME_ALERT error in Nginx Proxy Manager. Our Nginx Support team is here to help you with your questions and concerns.

SSL_ERROR_UNRECOGNIZED_NAME_ALERT in Nginx Proxy Manager

Have you been running into SSL certificate errors when trying to access your website over HTTPS (port 443)?

According to our Experts, this usually indicates a problem with the SSL certificate configuration.

Browsers expect a valid SSL certificate that matches the domain name being accessed.

The SSL_ERROR_UNRECOGNIZED_NAME_ALERT error indicates a security mismatch. The website’s SSL certificate doesn’t match the domain name we are trying to access.

Let’s look at some common causes and fixes for this error.

Common Causes

• Incorrect SSL Certificate Configuration

  The server does not have a certificate that matches the requested hostname. Also, the Nginx configuration may not include the correct server block for the requested hostname.
• DNS Issues

  The domain name does not point to the correct server IP address. Sometimes, there are issues with DNS propagation.
• Misconfigured Nginx Proxy Manager

  In case, the Nginx Proxy Manager is not set up correctly to handle the requested domain, we will run into the error. Sometimes the error is because the SSL certificates may not be correctly assigned in NPM.

Troubleshooting Tips

1. First, make sure the domain name is correctly pointed to the server’s IP address running Nginx Proxy Manager. We can use tools like `nslookup` or `dig` to verify DNS settings.

   nslookup bobcares.com
dig bobcares.com
2. Also, make sure the SSL certificate for the requested domain is correctly installed and associated in Nginx Proxy Manager. We have to check the certificate’s validity and make sure it covers the requested hostname.
3. Then, open the Nginx configuration files and check for the server block corresponding to the requested domain. Furthermore, check if the server block includes the correct `server_name` directive.

   For example:

   server {
listen 443 ssl;
server_name bobcares.com;
ssl_certificate /etc/nginx/ssl/bobcares.com.crt;
ssl_certificate_key /etc/nginx/ssl/bobcares.com.key;
# Other configurations
}

4. Next, check the Nginx Proxy Manager settings:
   • Log in to the Nginx Proxy Manager dashboard.
   • Then, go to the Hosts section and make sure the requested domain is correctly configured.
   • Also, check the SSL certificate is correctly assigned to the domain in the SSL section of the domain settings.
5. Then, make sure the Nginx Proxy Manager and its components are up to date. Sometimes, issues can be resolved by updating to the latest version.
6. Also, check the Nginx logs for more detailed error messages. We can find the logs usually at `/var/log/nginx/error.log` and `/var/log/nginx/access.log`.

   tail -f /var/log/nginx/error.log

Let us know in the comments if you need further help with the error.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

In brief, our Support Experts demonstrated how to fix SSL_ERROR_UNRECOGNIZED_NAME_ALERT error in Nginx Proxy Manager.