After installing and replacing a new SSL certificate on the server, why does the browser still show the old certificate information when accessing the website?

1. Restart server software: After installing a new certificate, you must restart your web server (such as Nginx, Apache, IIS, etc.) for the new certificate configuration to take effect.
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 that 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 balancer (SLB/CLB)
   • Reverse proxy server

If traffic passes through these devices first, you need to upload and deploy the new certificate on their consoles.