Website uses old certificate despite the fact that it was changed to a new one in domain's hosting settings

Symptoms

• Website example.com uses old SSL certificate despite the fact that it was changed to a new one in domain's hosting settings in Domains > example.com > Hosting Settings

• Reconfiguring of the domain example.com using the following command fixes the issue and the website starts using the new SSL certificate:

  # plesk repair web example.com

• The following error occurs in Nginx error log /var/log/nginx/error.log on a domain creation or a hosting settings update:

  CONFIG_TEXT: [emerg] 1048#0: open() "/var/www/vhosts/system/example.com/logs/proxy_access_log" failed (24: Too many open files)

Cause

The maximum number of open files is exceeded by Nginx server and reloading of the service failed to execute.

Resolution

1. Apply the solution described in nginx fails to start/reload on a Plesk server: Too many open files to fix the issue with Too many open files error.
2. Log into Plesk
3. Restart Apache and Nginx services at Tools & Settings > Services Management to apply changes.