If your system is configured to allow anonymous FTP logins and you expect to receive a lot of traffic, it makes sense to limit the number of connections that can be open to the FTP server at any one time. This puts a ceiling on the network and CPU load that FTP transfers can generate, which is important if the system is being used for some other purpose (such as running a web server).
This limit can be set globally, on a per-virtual server basis, or just for anonymous clients. This means that you can set a limit that applies to all servers, and then increase or decrease it for a particular virtual host. You can also set a lower limit for anonymous clients versus those that have valid logins.
ProFTPD can also be configured to limit the number of concurrent connections that a single client host can have. This is useful if you want to stop people from downloading more than one file at a time from your server, and thus taking more than their fair share of bandwidth.
To set a connection limit for your server, follow these steps:
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