This helped me out alot.
Solution for zFTPServer Suite users:
1.(A) Shut down the service part of zFTPServer.
2.(A) Open Settings.ini in the zFTPServer directory
3. Go to the [FTPS Ciphers] line. Below are the ciphers zFTP offers for negotiation.
4. Go to the end of the line listing the ciphers, and before the terminal double-quote, add:
[FTPS Ciphers]
"<List of other ciphers>,DHE-RSA-AES256-SHA,DHE-RSA-CAMELLIA256-SHA,DHE-RSA-AES128-SHA,DHE-RSA-CAMELLIA128-SHA"
5. (A) Save the file.
6. (A) Start the service again.
(A) means administrative privileges required.
The next zFTPServer version will likely have these ciphers included by default.
Solution for zFTPServer Suite users:
1.(A) Shut down the service part of zFTPServer.
2.(A) Open Settings.ini in the zFTPServer directory
3. Go to the [FTPS Ciphers] line. Below are the ciphers zFTP offers for negotiation.
4. Go to the end of the line listing the ciphers, and before the terminal double-quote, add:
[FTPS Ciphers]
"<List of other ciphers>,DHE-RSA-AES256-SHA,DHE-RSA-CAMELLIA256-SHA,DHE-RSA-AES128-SHA,DHE-RSA-CAMELLIA128-SHA"
5. (A) Save the file.
6. (A) Start the service again.
(A) means administrative privileges required.
The next zFTPServer version will likely have these ciphers included by default.