The FTPS MLSD/LIST commands return status code 450

Document ID : KB000113329
Last Modified Date : 07/09/2018
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Question:
Does the gateway support TLS resumption?
Answer:
No, the gateway does not support TLS resumption

If the "TLS session resumption on data connection" is checked, then gateway does not allow an ftp connection. You cannot reuse TLS/SSL session ID for data connections. 

Reuse TLS/SSL session id for data connections.