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Re: aes256-gcm not supported

Does you server really support no other cipher than the one proprietary
cipher of OpenSSH? That's quite limiting. WinSCP does not support this cipher.

For a list of ciphers supported by WinSCP, see:

If you want us to check further, please attach a full session log file showing the problem (using the latest version of WinSCP).

To generate the session log file, enable logging, log in to your server and do the operation and only the operation that causes the error. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.

aes256-gcm not supported

Couldn't agree a client-to-server cipher (available:
OK Verbinden Hilfe