A common issue we see in our web hosting support tickets and calls is clients accidentally triggering our anti-DoS attack prevention technology, triggering a 5 minute IP ban on their computer.
This technology helps prevent both small and large-scale attacks on our network by limiting the number of simultaneous connections from one IP address to a reasonable amount generally encountered during normal web, e-mail, and FTP traffic.
Unfortunately, the default settings on many FTP clients cause a large download or upload to make too many active connections, far more than is usually encountered in a regular FTP session, thus triggering the ban accidentally. This guide will show you how to configure your FTP client to avoid this. The examples below assume you're using FileZilla, but the settings should be similar in other FTP clients.
In FileZilla, go to the Edit menu and click Settings, then click the Transfers section on the left hand side to bring up the following menu. In this, make sure that the maximum simultaneous transfers is set to no higher than 2, and concurrent uploads and downloads are set to 2 as well.
You'll need to adjust one other setting in FileZilla. In the site profile you use to connect to your site, click on the Transfer Settings tab and adjust the number of simultaneous connections to no more than 2 and save the profile.
Using these settings you should not accidentally trigger our anti-DoS protection measures.
If you have any questions, please let us know.