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Date:	Tue, 06 Jan 2015 16:59:01 +0100
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To:	cygwin AT cygwin DOT com
Subject:	Re: SFTP Cipher Mismatch
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On 1/6/2015 2:47 PM, Chris Johnston wrote:
> Hello,
>
>   I am attempting to set up Cygwin for Cisco’s Disaster Recovery System
> (9. 1.2.10000-28) to run SFTP backups through. I have followed this
> guide that I found through online searches
> (https://supportforums.cisco.com/sites/default/files/legacy/0/3/2/41230-Cygwin%20Setup.pdf)
> and think I have everything set up correctly. I can use Filezilla
> through port 22 and the user account I set up through the Cygwin
> terminal to access the server I’d like to back up to. However when I
> attempt to set up the DRS on Cisco’s site I get an error message
> saying that “Update Failed: Unable to access SFTP server. Please
> ensure the Username and Password are correct.”
>
> I know what you’re thinking, “This is a Cisco Question, this guy sent
> to the wrong list”. Well I talked to Cisco TAC and after the run
> around they said to reach out to you folks because our CUCM is sending
> in aes-128-cbc, whereas Cygwin is replying back with aes-128-ctr,
> which they say is a mismatch and causing my problem. I checked my
> ssh_config and aes128-cbc is listed under Ciphers. Is there a way to
> change how Cygwin is replying? When searching I haven’t found a clear
> command that lets me change the default.  Cisco’s suggestion was...
>
> To check if aes-128-cbc is enable , go to C:\cygwin\etc\sshd_config
> and check if the following line is there:
>
> Ciphers aes256-ctr,aes192-ctr,aes128-ctr,arcfour256,aes128-cbc

aes-128-ctr is the first reported on my config
eventually it is used as default;
have you tried to put only a single line

Ciphers aes128-cbc

and check if that works ?


> If the line is there make sure you have aes128-cbc in there
>
> ...There was not a line specifying aes128-cbc in SSHD_Config, but as I
> understand it that means it would go to the default which was in the
> SSH_Config, which did include aes128-cbc. Cisco’s suggestion of copy
> and pasting that line in the sshd_config didn’t work. Any help would
> be greatly appreciated.
>
> All the best,
>
> cojohnst
>


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