Key authent doesn't work with open ssh 6.6

FTP client for Android handsets.

Key authent doesn't work with open ssh 6.6

Postby iuga2000 » Tue Nov 11, 2014 9:52 pm

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
iuga2000
 
Posts: 2
Joined: Tue Nov 11, 2014 9:45 pm

Re: Key authent doesn't work with open ssh 6.6

Postby support » Thu Nov 13, 2014 3:18 pm

Some 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
support
 
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Joined: Sun Apr 20, 2008 4:40 pm

Re: Key authent doesn't work with open ssh 6.6

Postby iuga2000 » Fri Nov 14, 2014 10:17 pm

Thank 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 ?
iuga2000
 
Posts: 2
Joined: Tue Nov 11, 2014 9:45 pm

Re: Key authent doesn't work with open ssh 6.6

Postby support » Sun Jan 25, 2015 3:00 pm

AndFTP 4.2 adds support for DH-SHA256 so there is not need to modify your SSH server configuration anymore.
support
 
Posts: 1021
Joined: Sun Apr 20, 2008 4:40 pm


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