The server initiates the data connection to the client. This is often blocked by modern firewalls.
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Ensure your FTP client is set to Passive Mode to avoid firewall connectivity issues. The server initiates the data connection to the client
: If you operate an FTP server as part of your origin infrastructure, ensure it is only accessible from CDN edge IP ranges and not directly reachable from the public internet. The same goes for SSH and mail services—misconfigured firewall rules are a primary leak vector. By combining the global reach and speed of
This article is for educational purposes only. Always obtain explicit authorization before performing discovery or penetration testing on any system you do not own.
HTTP is a stateless protocol that typically uses a single connection per request. FTP, by contrast, uses two separate channels—a command channel (port 21) for sending commands and a data channel (port 20) for transferring files. This bi-channel architecture is not something most CDNs are built to handle natively.