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. To avoid the blocking issue, making the following settings in the FileZilla program will be sufficient.
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 mark this section as Active.

Set the Concurrent transfers, Concurrent downloads, and
Concurrent uploads values in the Transfer section on the left menu to 1.

After making these settings, we save them by clicking OK. When we close and reopen the program, our settings will be effective and IP blocking will no longer occur during
file transfers via FTP.
Additionally, you can also use an FTP program called WinSCP. This program uploads files one by one and there is no blocking issue.
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