ioFTPD v5.x can only receive ssl fxp, not send. So when you fxp from ioFTPD v6.x to v5.x it should be encrypted - but when you do it the other way around (and have "Secure Site To Site Transfers" enabled for both) you will get that error message since v5.x cannot initiate the ssl transfer (just receive).
When the fxp works from v5.x to v6.x the data is not encrypted.
/ZR
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