FileZilla Passive Mode Port Range Behavior When Server Firewall Restricts High Ports
When configuring FileZilla for FTP transfers, the goal is to achieve reliable passive mode connections in both local and production environments. The client’s passive mode defaults to requesting a random port in the full 1024‑65535 range, which works locally where outbound traffic is unrestricted. In production, firewalls often block those high ports, causin
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