DFC treats locations with ftps:// or ftpes:// prefix the same but FTPS and FTPES are two different protocols. And DFC's implementation doesn't correctly support FTPS, cause always tries to negotiate SSL/TLS over FTP connection which is not valid for FTPS connection.

To fix this issue I propose to:

• clearly state that DFC supports FTPES, not FTPS (documentation change)
• remove support of ftps:// prefix
• change all occurrences of FTPS to FTPES