Subject: Bug#472: Debian now has diffie-hellman-group1-sha1 disabled

From: Alex DEKKER <[email-masked]>
Date: Sat, 11 Oct 2014 12:07:00 +0100

As of Version: 1:6.7p1-1 of openssh-server, it appears that Debian [and 
presumably upstream]'s sshd now has diffie-hellman-group1-sha1 disabled. 
This means that connections from x2goclient will fail.

I was able to work around this by adding:

KexAlgorithms 
[email-masked],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1

to /etc/ssh/sshd_config, but obviously at some point support for 
diffie-hellman-group1-sha1 is going to go away completely, rather than 
just being disabled by default.