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FTP Explicit fails on celluar data


I would suggest that traffic "optimization" at your provider causes the problems. Deep packet inspection to "optimize" traffic is very common for cellular networks and is often used to improve the traffic and sometimes also used to block unwanted traffic.

How this relates to your problem: Within cellular networks usually NAT is needed, that is you don't get a public IP address. But, at least the active mode in FTP needs a public IP and thus it is not uncommon to employ helper programs which translate IP and port for the PORT/EPRT commands inside the FTP control connection. These helper programs are not able to work with encrypted connections, which means they either block such connections on purpose or might block them by accident because they don't understand the traffic anymore.


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