Native FTP relay in squid doesn't use active mode between squid and FTP server.

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Issue

Native FTP relay is available from squid-3.5. squid-3.5 or later can handle active mode or passive mode between FTP client and squid. But this native FTP relay in squid always use passive mode between squid and FTP server.

Environment

Red Hat Enterprise Linux 7
squid-3.5 or later

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