I use AndFtp to connect on my synology NAS with RSA key. Synology updated recently openssh to V6.6 in last firmware (DSM 5.1). Since this upgrade, I can't connect with AndFtp , I have a message "algorithm negotiation failed" on scp protocol. It works with sftp but not with scp. I tried to regenerate a new key pair and use it, but I have the same message.
Others clients like connectbot continues to work.
Thank you for your help
Key authent doesn't work with open ssh 6.6
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Re: Key authent doesn't work with open ssh 6.6Some feedback from another user about possible cause:
Just wanted to pass along an issue I encountered this morning. The latest update to openssh on one of my Debian hosts made AndFTP unable to connect via ssh/scp. Long story made short, the KEX algorithm AndFTP uses appears to be no longer supported by the default openssh config. Going back and adding diffie-hellman-group-exchange-sha1 to the list of allowed algos got things working again. I imagine some users won't have the ability to modify their servers, though. The new list of default-supported algos is: curve25519-sha256@libssh.org, ecdh-sha2-nistp256, ecdh-sha2-nistp384, ecdh-sha2-nistp521, diffie-hellman-group-exchange-sha256, diffie-hellman-group14-sha1
Re: Key authent doesn't work with open ssh 6.6Thank you for this information
I can modify my server config. Do you know the name of the config file to change to add the right algorithm ?
Re: Key authent doesn't work with open ssh 6.6AndFTP 4.2 adds support for DH-SHA256 so there is not need to modify your SSH server configuration anymore.
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