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current TortoisePlink breaks with newer openssh

From: Exner, Michael <Michael.Exner_at_med.ovgu.de>
Date: Fri, 14 Aug 2015 12:46:22 +0000

Hi,

after upgrading openssh on my Linux-Server to openssh-6.9p1 tortoiseplink comes with “Server unexpectedly closed network connection” after a few seconds timeout.
The /var/log/messages file on server shows “error: Hm, kex protocol error: type 30 seq 1 [preauth]”

As a workaround, I use plink from putty (ver 0.62) instead of tortoiseplink and all work fine. (Except a bunch of ugly dos-boxes appearing and disappearing cause plink is a command line tool ☺)

With some search on internet I found the guessed reason:

On OpenSSH 6.9, old key exchange type SSH2_MSG_KEX_DH_GEX_REQUEST_OLD is deprecated as below.

So, tortoiseplink should no longer use the "Diffie-Hellman Group Exchange Request (Old) (30)" for ssh-connections.

Thanks in advance

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Received on 2015-08-14 14:48:50 CEST

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