Karen,
If you know how to get ssh2d386 to connect to a modern openssh, as on
Ubuntu 16.04,
please share the recipe with us!
Thanks,
Bill Dudley
This email is free of malware because I run Linux.
On Thu, Jan 26, 2017 at 9:10 PM, Karen Lewellen <klewel...@shellworld.net>
wrote:
> Well, if you have given up no point in my sharing.
> We use the same edition of Ubuntu, both with dreamhost who has my office,
> and here at shellworld.
> While the latter requires me to make use of a few ssh2021b options, the -g
> option for example, I encounter no issues.
> I am going to guess that things like machine speed, mine is a p3 with
> allot of memory, impacts your situation.
> nor, I would hope, your location in the world.
> Sorry I did not notice your post before you abandoned the effort.
> Kare
>
>
>
> On Fri, 27 Jan 2017, Ulrich Hansen wrote:
>
>
>> Am 26.01.2017 um 18:19 schrieb Karen Lewellen <klewel...@shellworld.net>:
>>>
>>> As I am presently writing this e-mail using ssh2d386 from the ssh2dos
>>> package ssh2021b, perhaps I can help you troubleshoot.
>>>
>>
>> Hi Karen!
>>
>> I am using the exact same program and version.
>>
>> for the record, I am not using freedos, but the ms dos 7.10 package
>>> mentioned on this list.
>>> Still every day several times a day I connect to two different servers
>>> using this package.
>>>
>>
>> I guess your servers still run OpenSSH in versions earlier than 6.9.
>>
>> may I ask again what your issue is presently?
>>>
>>
>> Actually I have given up on it. I spent another day trying to get it to
>> work, but without success.
>>
>> The problem is that I can’t connect to an Ubuntu 16.04 LTS server with
>> OpenSSH 7.2.
>>
>> SSH2D386 gives the message:
>>
>> Expected KEX_DH_GEX_GROUP
>> DH key exchange failed
>>
>> The server logs:
>> Jan 27 00:02:22 ubuntu-VirtualBox sshd[2651]: error: kex protocol
>> error: type 30 seq 1 [preauth]
>> Jan 27 00:02:22 ubuntu-VirtualBox sshd[2651]: error: Received
>> disconnect from 192.168.1.110 port 645:3: Expected KEX_DH_GEX_GRO
>>
>> As I wrote I already had problems connecting to a Debian 8 server with
>> OpenSSH 6.7.
>> But there I could fix it with these lines in /etc/ssh/sshd_config on the
>> server.
>>
>> Ciphers aes128-cbc
>> KexAlgorithms diffie-hellman-group-exchange-sha1
>> MACs hmac-sha1
>> HostKeyAlgorithms ssh-css
>>
>> But in OpenSSH 7.2 this didn’t work.
>>
>> What else did I try?
>>
>> I tried to set MTU=576 in C:\FDOS\WATTCP.CFG.
>>
>> I tried to recompile OpenSSH.
>> The first time with adding this line in in compat.c:
>> { "SSHDOS*", SSH_OLD_DHGEX },
>> The second time with this one:
>> { "SSHDOS*", SSH_BUG_NOREKEY|SSH_BUG_FIRSTKEX },
>>
>> Both were not able to let SSH2D386 connect. It worked great with other
>> SSH clients.
>>
>> The idea was that SSH2DOS uses code from PuTTY and there were already
>> several exceptions in combat.c for old PuTTY versions. The reason seems to
>> be that OpenSSH implemented RFC4419 and old PuTTY versions and SSH2DOS did
>> not. See [1], [2].
>>
>> I even looked at the SSH2DOS source code. But I have no experience with
>> OpenWatcom. I installed it but gave up, when I saw I also had to compile
>> the WATT32 TCP/IP stack.
>>
>> SSH2DOS uses PuTTY code, which is also Free Software. So in theory it
>> should be possible to replace the old PuTTY code with a more recent one.
>>
>> cheers
>> Ulrich
>>
>>
>> [1] https://forums.red-gate.com/viewtopic.php?f=198&t=78958
>> [2] http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/
>> rfc4419.html
>>
>>
>>
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