To avoid excessive usage of bandwidth, and protect your site from Denial Of Service attacks, you can limit bandwidth usage for a site and limit the number of simultaneous connections.
Important: To enable users to limit bandwidth in Plesk for Linux, the Plesk administrator must install the support for the Bandwidth Limiter for Apache through Tools & Settings > Updates and Upgrades > Add/Remove Components > Web hosting > Apache > mod_bw. Also, the administrator will need to stop nginx through Tools & Settings > Services management > stop Reverse Proxy Server (nginx). In Plesk for Windows, make sure that QoS Packet Scheduler is working in your system.
To limit bandwidth usage and number of connections to a site:
- Go to Websites & Domains and find the site's domain name.
- Click Bandwidth Limiting.
Note: This command is available only if your hosting provider has turned on the support for bandwidth limiting.
- Select the Switch on bandwidth limiting checkbox.
- In the Maximum bandwidth usage (KB/S) box, specify the maximum speed, measured in kilobytes per second, that a website can share among all its connections.
- Select the Switch on connections limiting checkbox.
- In the Connections limited to box, specify the maximum number of simultaneous connections to the site.
- Click OK.