[xubuntu-users] Failure to Connect SFTP Error

[fred roller]

...pipe outputted messages...

On Thu, Jun 1, 2017 at 7:54 PM, fred roller <fredroller66 at gmail.com> wrote:

> you could also try to fire Filezilla from cli with verbos turned up and
> piped to a log file locally.  May uncover a clue.  Since you are connecting
> via ssh you might try cli sftp connection as well to help isolate program
> issue or system issue.
>
> -- Fred
>
> On Thu, Jun 1, 2017 at 6:13 PM, Peter Flynn <peter at silmaril.ie> wrote:
>
>> On 06/01/2017 09:27 PM, Rog wrote:
>> > I rely on Filezilla to transfer files to my hosting service but it no
>> > longer works. It fails at the very beginning, failing to connect. Much
>> > searching w/ Google turns up no answers. Nor does a tech support
>> > consultation with the hosting service. The failure is NOT due to wrong
>> > username or password as I can establish ssh connections from the CLI.
>>
>> It's worrying when this happens, but hosting services are notorious for
>> changing things which don't affect Mac or Windows users, but which may
>> affect Linux users.
>>
>> From what you quote below it looks like it's having trouble identifying
>> which key exchange (kex) algorithm to use: the server wants you to use
>> diffie-hellman-group-exchange-sha256 but Konqueror can only use one of
>> curve25519-sha256 at libssh.org
>> ecdh-sha2-nistp256
>> diffie-hellman-group14-sha1
>> diffie-hellman-group1-sha1
>> This post https://ubuntuforums.org/showthread.php?t=2297006 (different
>> circumstances and different software) explains how to find out what
>> algorithms are supported, but it's a couple of years old.
>>
>> At a wild random guess the hosting company has changed things so that
>> they only support diffie-hellman-group-exchange-sha256, so you'll need
>> an sftp client that supports that method of key exchange. Obviously
>> FileZilla doesn't.
>>
>> Can you try again and note the EXACT date and time, then call tech
>> support and ask them to check the access logs (eg /var/log/secure) to
>> find out if they can see a request coming in from your IP address, and
>> being rejected.
>>
>> If you search Mr Google for
>>    filezilla diffie-hellman-group-exchange-sha256
>> you will gets lots of pages about this problem, so it seems to be well
>> known. Several posts make the suggestion along the lines of:
>>
>> > FileZilla's SFTP support is based on PuTTY's psftp. If you change the
>> > default key exchange cipher priorities in PuTTY, it should also
>> > affect FileZilla.
>>
>> but this may only apply to Windows clients. I'm afraid I don't have a
>> solution (and I just hope my own hosting provider doesn't make the same
>> move, although I only use FZ very rarely, as sftp from the command line
>> is fine for my own use).
>>
>> ///Peter
>>
>>
>> > Konqueror also fails to connect and gives the following, more detailed
>> > error:
>> >
>> >     The requested operation could not be completed
>> >
>> >     Details of the Request:
>> >     URL: sftp:// [redacted]
>> >     Protocol: sftp
>> >     Date and Time: Thursday, June 01, 2017 04:18 PM
>> >     Additional Information: kex error : no match for method kex algos:
>> >     server [diffie-hellman-group-exchange-sha256], client
>> >     [curve25519-sha256 at libssh.org,ecdh-sha2-nistp256,diffie-hel
>> lman-group14-sha1,diffie-hellman-group1-sha1]
>> >     Description:
>> >     kex error : no match for method kex algos: server
>> >     [diffie-hellman-group-exchange-sha256], client
>> >     [curve25519-sha256 at libssh.org,ecdh-sha2-nistp256,diffie-hel
>> lman-group14-sha1,diffie-hellman-group1-sha1]
>> >
>> > I note that I've gone so far as deleting all Filezilla-related files and
>> > re-installing it as well as deleting my known hosts file, to no avail.
>> > So I turn to this list in desperation. I would really like to continue
>> > to use Filezilla because it's fast and easy.
>> >
>> > --
>> > Roger
>> > linux.rog at gmail.com
>> >
>> >
>> >
>>
>> --
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>
>
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