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From: Yair Zaretski <zaretski AT me DOT com>
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Subject: Cipher Issue while Connecting from AIX
Message-id: <01C542E7-8E34-456F-8181-0F34E13C7CB3@me.com>
Date: Thu, 04 Dec 2014 16:15:50 +0200
To: cygwin AT cygwin DOT com
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Hi All,

I have an AIX machine which is trying to connect to an SSH server I’ve setup through Cygwin on a Win 2008 Server.
The connection is unsuccessful due to unmatched key exchange algorithms.

As far as I can tell, both the AIX machine and the Cygwin SSH server have at least a few SSH cipher algorithms in common.
However, even setting a specific cipher on the AIX side (via "ssh -c cipher-type" command) does not work.

Connection from any Linux server to the AIX and to the Cygwin SSH are successful.
In addition, connecting from the Cygwin to the AIX is successful.

I’d appreciate any help here.
Please see below the output of “ssh -v windows-server” command on the AIX server:

[aix-host] # ssh -v windows-server
OpenSSH_3.8p1, SSH protocols 1.5/2.0, OpenSSL 0.9.6l 04 Nov 2003
debug1: Reading configuration data /usr/local/etc/ssh_config
debug1: Connecting to windows-server [windows-server-ip] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/identity type -1
debug1: identity file /home/user/.ssh/id_rsa type 1
debug1: identity file /home/user/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.7
debug1: match: OpenSSH_6.7 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8p1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug1: kex: client->server aes128-ctr hmac-sha1 none
no kex alg 
[aix-host] #

Thanks.
Yair Zaretski


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