When uploading files via FTP with the FileZilla program, it connects to the server using multiple ports simultaneously. The security software on the server detects
these connections as an attack and blocks your IP address.
For this, you need to set FileZilla’s transfer mode to Active.
We open the FileZilla program and go to the Settings section from “Edit”.

When we enter the Settings
section, from the window that appears, we click on the “FTP” heading on the left side. The transfer mode will come pre-selected as “Passive (recommended)”.
We check the “Active” option and click the “OK” button.

- Set the Concurrent transfers, Concurrent downloads, and
Concurrent uploads values in the “Transfer” section on the left side to 1.
The settings are complete. You can close your FTP program and try reconnecting.
You can also try an FTP program called WinSCP. This program uploads files one by one and
there is no blocking issue.
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