If you get this message, then you have to alter the proFTPD configuration file. To do this open proftpd.conf with nano, the file editor. Then you will have to edit a specific line.
sudo nano /etc/proftpd/proftpd.conf
Comment out MaxClients 3 and MaxClientsPerHost 1
By adding # in front of these lines.
Or you can modify the values.
At the end, restart proFTPD.
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