(Plesk for Windows) Limiting Bandwidth and The Number of Connections to a Website
To avoid excessive usage of bandwidth and protect your website from denial-of-service attacks, you can limit the bandwidth usage of a website and the number of simultaneous connections to it.
To limit bandwidth usage and the number of connections to a website:
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Go to Websites & Domains > the website whose bandwidth and connections you want to limit > the “Hosting & DNS” tab > Bandwidth Limiting.
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Next to “Maximum bandwidth usage”, clear the “Unlimited” checkbox, and then specify the maximum speed a website can share among all its connections. The speed is measured in kilobytes per second.
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Next to “Connections limited to”, clear the “Unlimited” checkbox, and then specify the maximum number of simultaneous connections to the website.
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Click OK.