Ok I have mailed back and forth with InterVations (FileCOPA).
They say that you talked back and forth and attached the mails.
Basically what they told me was that v10 of FileCOPA which isn't out yet, will have the updated SecureBlackBox. But they also said that 9.01, while using the older version, it also doesn't advertise that it supports the gcm cipher. They say it's a FlashFXP issue that FlashFXP attempts to use this cipher when it's not advertised as supported.
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We did indeed reply to Charles DeWeese, twice. We looked into this problem
quite deeply. I have attached his original email to us and our two replies.
There was a problem in both software. The problem in FileCOPA was fixed
and is in the current release. As we got no reply from Charles we do not
know if he fixed the problem on his end.
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V9 uses SBB V12. However, if you read the email closely, that is not the
problem.
An SFTP server advertises the ciphers that it supports. A client should
pick from one of those ciphers to use. FileCOPA does not support
AES256-GCM and it doesn't advertise the fact in the query packet, however
FlashFXP *still* chooses to use that cipher. It is wrong. It doesn't
matter what SBB FileCOPA is using, FlashFXP is attempting to use a cipher
that is not supported, it shouldn't be doing that.
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So is there anything that can be improved upon?
I can forward you the whole mail correspondence if you wish.