Why does the browser still display the old SSL certificate information when accessing the website after I installed and replaced a new SSL certificate on the server?

1. Restart the server software: After installing the new certificate, you must restart your web server (such as Nginx, Apache, IIS, etc.) to load and apply the new certificate configuration.
2. Check intermediate devices/services: If the issue persists after restarting the server, check whether the following intermediate devices exist in your website architecture, and ensure the certificate is also updated on these devices:
   • CDN / cloud acceleration services (such as Tencent Cloud CDN, Alibaba Cloud CDN, Cloudflare, etc.)
   • Web Application Firewall (WAF)
   • Load balancers (SLB/CLB)
   • Reverse proxy servers If traffic passes through these devices first, you need to upload and deploy the new certificate in their respective consoles.