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Re: [Freedos-user] SSH2DOS - no connection with recent servers
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From: Karen L. <kle...@sh...> - 2017-01-27 04:42:51
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Hi Bill,
While I appreciate your desire for wisdom, I feel rather sure my specific
situation will not apply to anyone else here most likely.
I use ssh2d386 to access at least one commercial shell, but those shell
services are maintained by others. I am not for example accessing my own
server.
If the servers you desire reaching are run by other people, give me an
example and I will try.
If my many years of computing has taught me anything is that the word
Personal is important for a reason.
Kare
On Thu, 26 Jan 2017, William Dudley wrote:
> 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 <kle...@sh...>
> 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 <kle...@sh...>:
>>>>
>>>> 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 canât 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 didnât 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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>>>
>>
>> ------------------------------------------------------------
>> ------------------
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>>
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