Description of problem: I've try setup new winswitch server on Fedora and connect to them. But connection from GUI client fails without any details. On server i see in /var/log/secure: Jan 1 16:14:26 digitalocean sshd[4315]: fatal: Unable to negotiate with 178.130.41.238: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth] After add (https://bbs.archlinux.org/viewtopic.php?pid=1521264#p1521264) into /etc/ssh/sshd_config: KexAlgorithms curve25519-sha256,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 I got (after some timeout) another error: Jan 1 16:19:18 digitalocean sshd[4345]: error: Hm, kex protocol error: type 30 seq 1 [preauth] Jan 1 16:27:48 digitalocean sshd[4350]: Connection closed by 52.24.186.120 [preauth] I also found that blog post https://blog.nytsoi.net/2015/07/13/putty-kex-error and it seams relative. Possible winswitch tries connect with old pre-RFC4419 group exchange message. Version-Release number of selected component (if applicable): $ rpm -q winswitch winswitch-0.12.21-17.fc23.noarch On server: # rpm -q openssh openssh-7.1p1-6.fc23.x86_64 How reproducible: Always
This seems to be this: https://winswitch.org/trac/ticket/270 https://winswitch.org/trac/ticket/285
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